The following image shows a Robertsonian translocation between chromosomes 13 and 21. This has the potential to cause Down Syndrome in offspring. The couple had 6 pregnancies. What is the probable cause for the two miscarriages you see in the pedigree? See the legend for more information. Briefly explain your answer. male female miscarriage chromosome 13 chromosome 21 Robertsonian translocation Carrier Normal der(13;21)(q10;q10)
Q: For a hexaploid what is the value of x where x refers to the basic chromosomenumber that makes up a…
A: Ploidy refers to the number of chromosomes present in the nucleus of a cell. In normal somatic…
Q: The ABO blood type locus has been mapped on chromosome 9. A father who has type AB blood and a…
A: A cross is made between a male and a female the male having an 'AB 'blood group and the mother…
Q: Identify each of the following statements as true or false. The two white chromosomes in B are…
A: Chromosomes are rod-shaped chromatin fibers that appear only during karyokinesis. They act as a…
Q: . If the G locus were 50 or more map units from the centromere, what types and proportions of…
A: Tetraploid means the the species has 4 copies of the genes present ie two diploid gametes would meet…
Q: Mules result from a cross between a horse (2 n = 64) and a donkey (2 n = 62), have 63 chromosomes,…
A: Meiosis is the process through which gametes are formed. It includes a reduction in the number of…
Q: A young couple is planning to have children. Knowing that there have been a substantial number of…
A: Robertsonian translocations are defines as the structural chromosomal abnormalities that is caused…
Q: From the given pedigree below, fill the table and answer the question: If the proband (III-2)…
A: The pedigree analysis helps in understanding the mode of inheritance of a particular disease by…
Q: Who is the proband in a pedigree? Is the proband always found in the last generation of the…
A: Pedigree analysis is a scientific approach that helps to study the inheritance of genes. In this…
Q: Lois and Peter, who are each NOT trisomic for chromosome 21, are awaiting the birth of a 2nd child…
A: *Given that Lois and Peter are not trisomic for chromosome 21. * The probability of Down syndrome is…
Q: Genes that cause Prader-Willi syndrome and Angelman syndrome are closely linked along chromosome 15.…
A: Chromosomes are long thread-like structures that carry coded genetic information in the form of DNA.…
Q: A person with Down syndrome has three copies of chromosome 21. Which of the following words should…
A: Triploid is used for defining the genomic content of an organism so, here the genomic content is 3n.…
Q: . What is the probability of producing a child that willphenotypically resemble either one of the…
A: The phenotype is the physical expression of the trait. It is an observable characteristic of an…
Q: A wild-type chromosome has the following segments: A B C • D E F G H I Researchers have found…
A: They coil under the light microscope during prophase I and become shorter and thicker and more…
Q: The following pedigree shows the inheritance of a disease due to a completely penetrant sex-linked…
A: Sexual intercourse refers to genetic patterns that are specific to the gender in which the genetic…
Q: A phenotypically abnormal individual has a phenotypically normalfather with an inversion on one copy…
A:
Q: An individual inherits a set of translocated chromosomes (2 and 3) from one parent and a wild type…
A: For certain basic eukaryotes, such as yeast, meiosis is the method used for survival. Yeast…
Q: Assume that you are married and by chance upon submission for an amniocentesis prenatal checkup it…
A: Prenatal tests are diagnostic tests conducted during pregnancy period to diagnose abnormalities or…
Q: Human sex-linked disorders in which male children are affected and female children are carriers are…
A: Sex-linked or X-linked disorders mainly affect the males. Some sex-linked disorders are colour…
Q: The incidence of Down syndrome will be high (nearly 50%) among the offspring of a parent with Down…
A: Down Syndrome is a chromosomal disorder where trisomic conditions occurs in 21th chromosom. The…
Q: Thorn apples produce either purple (P) or white (p) flowers, and their fruits are either spiny (S)…
A: Purple (P) flowers = dominant White (p) flowers= recessive Spiny (S) = dominant Smooth (s)=…
Q: Mules result from a cross between a horse (2 n = 64) and a donkey (2 n = 62), have 63 chromosomes,…
A: When the female horse is mated with the male donkey, produces a mule having 63 chromosomes. The…
Q: A geneticist crosses two yellow mice with straight hair and obtains the following progeny: 1/2…
A: A dihybrid cross is a pairing procedure in which two different, genetically determined…
Q: In the human pedigree shown below, black filled symbols indicate individuals suffering from a rare…
A: The pedigree is a family tree diagram that depicts the inheritance pattern in a family. The female…
Q: A man who is a carrier of a translocated 15/21 chromosome marries a genotypically normal woman. a.…
A: The condition is termed Robertsonian translocation. Explanation: Every individual has his / her…
Q: The pedigree below shows a family where several members (filled boxes) are affected with a genetic…
A: Pedigree : Pedigree analysis is a graph that depicts a family tree and shows which family members…
Q: crossing over within a pericentric inversion produces chromosomes that have extra copies of some…
A: Chromosomes having extra copies or no copies of genes are produced by crossing over within a…
Q: A young couple is planning to have children. Knowing that there have been a substantial number of…
A: Robertsonian translocation is a kind of chromosomal abnormality in which two acrocentric chromosomes…
Q: Genes G and H are located on chromosome 18. A woman with the genotype Gg Hh has a child with a man…
A: Nondisjunction refers to the failure of homologous and sister chromatids to divide.
Q: The pedigree below shows three generations of a family that carries albinism, an autosomal recessive…
A: Pedigree chart: It is a chart that shows the family genetic history. It is used to determine the…
Q: If the G locus were 50 or more map units from the centromere, what types and proportions of gametes…
A: Recombination in terms of genetics describes the process that explains the exchange of genetic…
Q: Thorn apples produce either purple (P) or white (p) flowers, and their fruits are either spiny (S)…
A: A gene is a unit of hereditary present in thousands on the strands of DNA(deoxyribonucleic acid).…
Q: When 23 pairs of human chromosomes are arranged in a diploid set, this layout is called a
A: A chromosome is a long DNA molecule with part or the entirety of the hereditary material of a…
Q: A wild-type chromosome has the following segments: A B C • D E F G H I Researchers have found…
A: Chromosomal aberrations are changes in the number and arrangement of genes in the chromosomes. They…
Q: Non-disjunction of chromosome 21 during meiosis one followed by fertilization can result in all of…
A: An zygote with nondisjunction has 3 duplicates of chromosome 21 rather than the usual two. A pair of…
Q: Genes A and B are on different chromosomes. An individual has the genotype: AaBb You sequence two…
A: Meiosis is the reductional division. during this the chromosome number is reduced to half and from a…
Q: Here is a karyotype made from cancer cells. Which of the following abnormalities can be detected?…
A: A karyotype is the representation of an individual's/organism's complete set of chromosomes. These…
Q: Parents pass chromosomes in gametes to form the zygote, which will grow and develop to become an…
A: Sperm of father will have 23 chromosomes (haploid) that fuse with ovum of mother containing 23…
Q: Lois, who recently had her karyotype performed, was shown the following figure from her family…
A: *Given that Peter and Lois and performed karyotype. * And Lois do not show any symptoms and sign of…
Q: As a graduate student, you join a lab and you are looking through some old notebooks. You find a…
A: Map distance is defined as the distance between two genes loci present on a chromosome. It is…
Q: In the figure below, black and pink lines are used to represent nonhomologous chromosomes. Which of…
A: Genetic recombination occurs during the Prophase of the first meiotic division when gametes are…
Q: An individual that is heterozygous for an inversion has the following chromosomes (∗ is the…
A: Introduction :- Crossing over is defined as the exchange of segments ( chromosomal segments)…
Q: there are 9 chromosome pairs, how many univalents are there at anaphase I on each pole?
A: Anaohase 1 is the stage of meiotic first division in which the paired chromosome separates and move…
Q: Mules result from a cross between a horse (2 n = 64) and a donkey (2 n = 62), have 63 chromosomes,…
A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…
Q: Change in chromosome numbers will lead to abnormalities. Which of the following is a correct match…
A: Introduction A karyotype is a preparation of the entire set of metaphase chromosomes in the cells of…
Q: What would be the chromosome number of progeny resulting from the following crosses in wheat? What…
A: The complete chromosome sets present in the cells of an organism is referred to as ploidy. Humans…
Q: From 2 to 6 percent of people with autism have an extra chromosome that consists of two long arms of…
A: Isodicentric 15 It is also called idic15 and inverted duplication 15. It is an chromosome…
Q: phenotypically normal woman has an abnormally structured chromosome 2, along with a normal…
A: Probability of woman passing down abnormally structured chromosome 2 is 1/2 Woman ----- 1/2…
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- A colleague e-mails you saying that she has identified an interesting chromosome variation at 21q13. In discussing this discovery with a friend who is not a cytogeneticist, explain how you would describe this location, defining each term in the chromosome address 21q13.Assume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?In Neurospora, his2 mutants require the amino acidhistidine for growth, and lys4 mutants require theamino acid lysine. The two genes are on the samearm of the same chromosome, in the ordercentromere - his2 - lys4.A his2 mutant is mated with a lys4 mutant. Draw all ofthe possible ordered asci that could result from meioses in which the following events occurred, accountingfor the nutritional requirements for each ascospore.Ascospores without any copy of a chromosome willabort and die, turning white in the process.a. A single crossover between the centromere and his2b. A single crossover between his2 and lys4c. Nondisjunction during the first meiotic divisiond. Nondisjunction during the second meiotic divisione. A single crossover between the centromere andhis2, followed by nondisjunction during the firstmeiotic divisionf. A single crossover between his2 and lys4,followed by nondisjunction during the firstmeiotic division
- A woman who sought genetic counseling is found to be heterozygousfor a chromosomal rearrangement between the second andthird chromosomes. Her chromosomes, compared to those in anormal karyotype, are diagrammed on the next page:(a) What kind of chromosomal aberration is shown?A normal female is discovered with 45 chromosomes, one ofwhich exhibits a Robertsonian translocation containing most ofchromosomes 18 and 21. Discuss the possible outcomes in heroffspring when her husband contains a normal karyotype.A woman who sought genetic counseling is found to be heterozygousfor a chromosomal rearrangement between the second andthird chromosomes. Her chromosomes, compared to those in anormal karyotype, are diagrammed on the next page:(a) What kind of chromosomal aberration is shown? (b) Using a drawing, demonstrate how these chromosomeswould pair during meiosis. Be sure to label the differentsegments of the chromosomes.(c) This woman is phenotypically normal. Does thissurprise you? Why or why not? Under what circumstancesmight you expect a phenotypic effect of such arearrangement? The woman in above problem has had two miscarriages. Shehas come to you, an established genetic counselor, with thesequestions:(a) If not, what is the chance that she could have a normalchild? Provide an informed response to her concerns
- A woman who sought genetic counseling is found to be heterozygousfor a chromosomal rearrangement between the second andthird chromosomes. Her chromosomes, compared to those in anormal karyotype, are diagrammed on the next page:(a) What kind of chromosomal aberration is shown? (b) Using a drawing, demonstrate how these chromosomeswould pair during meiosis. Be sure to label the differentsegments of the chromosomes.(c) This woman is phenotypically normal. Does thissurprise you? Why or why not? Under what circumstancesmight you expect a phenotypic effect of such arearrangement? The woman in above problem has had two miscarriages. Shehas come to you, an established genetic counselor, with thesequestions:(a) Is there a genetic explanation of her frequent miscarriages?A young couple is planning to have children. Knowing that there have been a substantial number of stillbirths, miscarriages, and fertility problems on the husband’s side of the family, they see a genetic counselor. A chromosome analysis reveals that, whereas the woman has a normal karyotype, the man possesses only 45 chromosomes and is a carrier of a Robertsonian translocation between chromosomes 22 and 13. Q. What types of zygotes will develop when each of gametes produced by the man fuses with a normal gamete produced by the woman?Imagine a germ cell for an animal that is 2n=4. Gene A and B are found on chromosome one, and the cell is homozygous for A(AA) and heterozygous for Bb. Gene D is found on chromosome 2 and the germ cell is heterozygous for the Allee of the gene (Dd). Meiosis for this germ cell results in the following four gametes, and one crossing over event during meiosis ABD, ABd, AbD, Abd. Draw the chromosomes in cell during metaphase of meiosis 1. Make sure to include chromosomes, the allele in the correct locations on the chromosomes AFTER the crossing over event, and spindle fibers.
- The organism you are working with has the following chromosomes. Place the chromosomes of this organism onto the cell below such that the diagram accurately shows a primary meiocyte from this organism in metaphase I of meiosis. Note 1: Only place chromosomes you need. You don't need them all. Note 2: You can place the 'Blank Box' image if you don't think you need a chromosome at a particular position. Dashed linethe metaphase plateShown below are photomicrographs of Rhoeo tradescantia cells undergoing meiosis. Answer the following question for each of the photomicrographs: Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge). Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph). Explain how these aberrations are formed and relate to the possible causal mutation(s). Will this result to sterile and/or fertile gametes? Explain.A man who is a carrier of a translocated 15/21 chromosome marries a genotypically normal woman. a. Show the possible gametes that will be formed by this man if the translocated 15/21 chromosome synapses with chromosome 21 at Prophase I.