Consider two hypothetical recessive autosomal genesa and b, where a heterozygote is testcrossed to a doublehomozygousmutant. Predict the phenotypic ratios underthe following conditions:(a) a and b are located on separate autosomes.(b) a and b are linked on the same autosome but areso far apart that a crossover always occurs betweenthem.(c) a and b are linked on the same autosome but are soclose together that a crossover almost never occurs

Q: Describe how a biparental pattern of extranuclear inheritancewould resemble a Mendelian pattern of…

A: Inheritance is the transmission of traits from one generation to the next.

Q: An individual  heterozygous for a reciprocal translocation possesses the following chromosomes:  A B…

A: Translocation is caused by the separation of a chromosome segment and its union with a…

Q: Mitotic recombination can occasionally produce a twin spot.Let’s suppose an animal species is…

A: It is given to suppose that if an animal species is heterozygous for the 2 gene governing fur colour…

Q: Ehler-Danlos syndrome is a rare disorder caused by a mutation ina gene that encodes a protein called…

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

Q: Regarding Mendelian inheritance in diploid individuals, (Read each statement carefully. Select all…

A: Ploidy is a term which describe the number of sets of chromosomes in a cell. The term haploid…

Q: 5) Humans who have an abnormally high level of cholesterol are said to suffer from familial…

A: Introduction :- Familial hypercholesterolemia is an inherited disorder characterized by elevated…

Q: A researcher is working with a flower species in which red flower color (R) is dominant to white…

A: In genetics , cross are done between selected species having a particular allele combination to…

Q: Let’s suppose that a gene affecting pigmentation is found on the Xchromosome (in mammals or insects)…

A: Introduction  The total chromosomes in the body are divided into two groups: Autosomes…

Q: For the following chromosome complements, what is the phenotypic sex of a person who has Q. XO with…

A: The male sex-determining gene in human is termed as the sex determining region Y (SRY) gene.…

Q: An inversion heterozygote has the following inverted chromosome. (A diploid is represented in each…

A: PERICENTRIC INVERSIONS PERICENTRIC INVERSION includes the centromere. After the chromatid…

Q: Though an individual with abberations such as Robertsonian translocation may be phenotypically…

A: Meiosis is defined as a process where a single cell will divide twice to generate four cells that…

Q: what is the probability that he might be a carrier of the recessive gene?

A: Cystic fibrosis is associated with the CFTR gene that encodes a protein that helps thin the mucous…

Q: In addition to the predominant adult hemoglobin,HbA, which contains two α-globin chains and…

A: Crossing over occurs during prophase I of meiosis. The pairing of chromosome occurs at tandem…

Q: In a sample of 1000 patients with Down syndrome, a geneticist discovers that 95% of them are…

A: Trisomy is a kind of polysomy in which three instances of a particular chromosome occurs. Generally…

Q: Explore chromosomal defects among humans in Ensembl at…

A: Defects in the structure or quantity of chromosomes in a person's cells are referred to as…

Q: A gene involved with body colour in this species of fruit fly is located on the non-homologous…

A: The Gene for Eye Color in Drosophila: Red vs. BrownIntroductionThis species of fruit fly possesses a…

Q: Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a…

A: Chromosomal deletion syndrome occurs when whole or part of chromosomes are missing. Turner Syndrome…

Q: Biology Question

A: All plasma membranes contain proteins and lipids as components. The basic structure of the plasma…

Q: . Human geneticists interested in the effects of abnormalities in chromosome number often…

A: The abnormal number chromosomes in the cell is called as aneuploidy. For example, instead of 46…

Q: During the pathoanatomic inspection of a baby-boy's dead body the following abnormalities:…

A: Chromosomal disorder are the abnormalities that arises due to alterations in chromosome arrangement…

Q: On rare occasions, an organism may have three copies of achromosome and therefore has three copies…

A: Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly…

Q: Drosophila females of wild-type appearance but heterozygous for three autosomal genes are mated with…

A: Let us represent the alleles responsible for wildtype eyes, wildtype bodies, and wildtype thoraxes…

Q: For a certain gene in a diploid organism, eight units ofprotein product are needed for normal…

A: a.  We cannot expect the mutation to be recessive,it may rather be dominant.This is an example of a…

Q: Could the pedigree in Figure 2-31 be explained as an autosomal dominant disorder? Explain.

A: The genetic and phenotypic traits being passed from one generation to the other are called…

Q: This is a typical pedigree for a family that carries neurofibromatosis. Is individual I-2 most…

A: Pedigree analysis can help to determine genotypes, identify phenotypes, and predict how a trait will…

Q: DRAW IT Suppose, as in the questionat the bottom of Figure 15.9, the parental(P generation) flies…

A: Consider the following V= Normal wing v= Vestigial wing G= Gray body-color g= Black body-color Then,…

Q: Draw a diploid cell heterozygous for genes a, b, c. Genes a,b,c are linked and autosomal.

A: Genes are hereditary units present on the chromosomes. A gene has two allelic variants. These…

Q: For a certain chromosomal region, the mean number ofcrossovers at meiosis is calculated to be two…

A: For a certain chromosomal region, the mean number ofcrossovers at meiosis is calculated to be two…

Q: What kind of chromosomal mutations is/are produced by unequal crossing over?

A: Mutation refers to both the process of altering a gene or chromosome and the outcome of that…

Q: A male Drosophila from a wild-type stock is discovered to have only seven chromosomes, whereas…

A: As mentioned the chromosome IV is attached to the distal end (which is farther from the centromere…

Q: On Neurospora chromosome 4, the leu3 gene is just to theleft of the centromere and always segregates…

A: Introduction: During the zygotene phase, a structure known as the synaptonemal complex forms between…

Q: Gene A and gene B are two linked geres uwhich are separated bg 15CM. A women with the genokype aaob…

A: The genetic distance between two genes suggests the recombination frequency between two genes.

Q: In examining a large sample of yeast colonies on a petridish, a geneticist finds an abnormal-looking…

A: It has been observed that there is an equal amount of segregation that takes place within a…

Q: If you assume Figure 2-15 also applies to mice and youirradiate male sperm with X rays (known to…

A: The similar regions in two chromosomes  are considered to be homologous. Hence the X and Y…

Q: While most animals cannot tolerate polyploidy, somemollusks, such as oysters, can. Although wild…

A: Some mollusks such as oysters tolerate polyploidy. Farmed oysters are triploid while the wild…

Q: You have spent two decades studying a muscular dystrophy disorder. All previous pedigree data…

A: X linked disease is a type of sex linked disease in which the mutation is present in X chromosome.…

Q: A male Drosophila from a wild-type stock is discovered to haveonly seven chromosomes, whereas…

A: In male drosophila, one member of chromosome IV has translocated to the distal end of Chromosome II.…

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.