A phenotypically normal boy has 45 chromosomes, but his sister, who has Down syndrome, has 46. Suggest an explanation that explains both children.

Q: Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one…

A: Down's syndrome occurs due to an error at the time of gamete formation. As a result the gametes may…

Q: Could there be any significance to the fact that the crosses concern genes on a very small…

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

Q: I have a doubt, I'm not sure if the chromosomes are a boy or a girl? Or if the chromosomes have any…

A: Monosomy is an aneuploidy in which only one of a pair of chromosomes is present. When a section of…

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: Why is the term “crossing-over” appropriate for the exchange of DNA segments between homologous…

A: Crossing over can be defined as the exchange of genetic material that occurs between the non-sister…

Q: Raj Kumar and his wife Sunita have been blessed with a baby girl. On the other hand, Kripa Shanker…

A: Reproduction ensures the continuity of species on earth. It can occur in two ways that is sexual…

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: Referring to Figure 17-19, draw a diagram showing the process whereby an inversion formed from…

A: An inversion is a type of chromosomal rearrangement in which a chromosomal segment is reversed end…

Q: Explain why genes located on the same chromosome are said to be linked. Why do alleles of linked…

A: A gene is a unit of hereditary arranged in thousands on the strands of DNA(deoxyribonucleic acid)…

Q: Person A has a mutation in a chromosome in a liver cell, while person B has a mutation in a…

A: Mutation refers to sudden heritable change in the phenotype of an individual. In the molecular term,…

Q: Why is the development of individuals with Klinefelter's and Turner's syndromes relatively normal,…

A: This syndrome occur due to presence of an additional copy of X chromosomes resulting into karyotype…

Q: Consider the example of the fusion of chromosome 21 and 14. By itself, this fusion does not cause…

A: In humans, when the long arm of chromosome 21 is joined to the long arm of chromosomes 14 or 15, the…

Q: You are a gene hunter, trying to find the genetic basis for a rare inherited disease. Examination of…

A: It is given that the rare inherited disease is co-inherited with the markers on the chromosome 7 for…

Q: Do you think mendal's law of inheritence would have been different if the character that he choose…

A: Gregor Mendel was a scientist who worked in the field of molecular biology and genetics. These…

Q: The two telomeric loop structures are formed by invasion of the 3' single-strand overhang. Draw the…

A: The chromosomes of the eukaryotes end in telomeres, which consist of tandem repeats of a short…

Q: why why heterozygosity for a deletion can be harmful?

A: Deletion refers to a type of mutation in which the genetic material in a chromosome is deleted or…

Q: Fetuses whose cells are triploid, that is, contain three full sets of chromosomes, develop to term…

A: INTRODUCTION The DNA molecule is packed into thread-like structures called chromosomes in the…

Q: Why is random assortment of chromosomes necessary? What can we expect if this does not occur?

A: When reproductive cells mature, the Principle of Independent Assortment outlines how various genes…

Q: You are transported to a fantasy world where legendary creatures actually exist. In this world, a…

A: Unicorn is a bisexual horse with a single straight horn projecting from its forehead. It is…

Q: Karl and Hally Sax crossed Aegilops cylindrica (2 n = 28), a wild grass found in the Mediterranean…

A: Karl and Hally Sax conducted a cross between Aegilops cylindrical (2n = 28) and Tridcum vulgare (2n…

Q: Two phenotypically unaffected parents produce two children with familial Down syndrome. Regarding…

A: A phenotype is the observable physical and functional traits of an organism which result from the…

Q: Briefly explain why, in humans and other mammals, sex-chromosome aneuploidies are more common than…

A: A chromosome is an organized bundle of DNA found within the nucleus of the cell. Different living…

Q: Homologous chromosomes can be either monads or dyads. Explain. How is it possible to have…

A: Homologous chromosomes are paired chromosomes. In this pair one chromosome comes from mother and one…

Q: Using photographs one and two in the PDF supplemental handout on Canvas, answer the following…

A: Answer. Aneuploidy involves changes in chromosome number by addition or deletion of less than a…

Q: Explain why small deletions and duplications are less likely tohave a detrimental effect on an…

A: A mutation is a permanent change in the DNA of a cell such that the sequence deviates from what is…

Q: Refer to the figure showing a pair of homologous chromosomes. What process is demonstrated in this…

A: Introduction Meiosis is a type of cell division that occurs in sexually reproducing organisms' germ…

Q: The following question refers to Drosophila that are heterozygous for three different genes A, B,…

A: It seems that the first question that you have posted is opinion based and as per the honor code we…

Q: The pedigree suggests which mode of inheritance for an allele on chromosome 15? 뭉 '담담요

A: In a dominant trait, even if one allele is defective, the disease will manifest. In case of…

Q: Karl and Hally Sax crossed Aegilops cylindrica (2 n = 28), a wild grass found in the Mediterranean…

A: Inheritance is the process of transmitting the traits from parent to offspring. Traits of an…

Q: Two phenotypically normal parents produce an abnormal son in which chromosome 14 is missing part of…

A: Translocations are chromosomal rearrangements caused by the exchange of components between two…

Q: Chorionic villus sampling is a procedure to determine if there are any abnormalities in chromosome…

A: Chorionic villus sampling is also used for the same purpose. Chorion is basically a membrane that…

Q: Part of the karyotype of a diploid individual who is heterozygous for one chromosomal rearrangement…

A: Chromosomal rearrangements are structural changes to chromosomes that affect how the genetic…

Q: A cross between two heterozygous individuals in one gene resulted in one phenotype, explain?

A: Sir Gregor Mendel was a priest and a teacher who did the famous hybridization experiment on garden…

Q: hat is the 2n number for the dog?  What is the n number for the dog?

A: 2n number of the dog=78

Q: Why are the X and Y chromosomes not considered homologous even though they recombine at the PAR…

A: Sex chromosomes are a type of chromosome that participates in sex determination. Humans and most…

Q: Rainbow trout go through a unique genetic reproductive process. Female eggs are diploid, while male…

A: Chromosomes are thread-like structures present inside the nucleus of the cell. Usually, they are…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.