Female fruit flies homozygous for the X-linked white-eye alleleare crossed to males with red eyes. On very rare occasions, an offspringof such a cross is a male with red eyes. Assuming these rareoffspring are not due to a new mutation in one of the mother’s Xchromosomes that converted the white-eye allele into a red-eyeallele, explain how a red-eyed male arises.

Q: EVOLUTION CONNECTION Crossing over is thought to beevolutionarily advantageous because it…

A: Many of the genes which are essential for the production of sperm are located on the Y chromosome.…

Q: In female mamals, X chromosome inactivation often leads to phenotypic mosaicism. Assume that black…

A: Coat color in animals is controlled by either autosomal or sex-linked genes. Coat color is 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: In a fungus with four ascospores, a mutant allele lys-5 causes the ascospores bearing that allele…

A: An ascus is a sac-like structure within an ascomycete fungi that contains ascospores. Ascospores are…

Q: In the experiment of Figure shown, Stern followed the inheritancepattern in which females carried…

A: Step 1 Sex linkage is a linked group of genes found along with sex controlling genes as present on…

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

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A: Crossing over is a phenomenon that occurs in the linked genes. When the crossing over occurs between…

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: In Drosophila, M. Green found a singed allele (sn) withsome unusual characteristics. Females…

A: Each gene in the DNA that is coding for a specific protein/trait has two variants called alleles.…

Q: When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation…

A: The result observed by Thomas Hunt Morgan, where all the white-eyed flies in the F2 generation were…

Q: You continue your experiments with the black mutation on chromosome II. You cross the reciprocal…

A: Introduction: The most advancing branch of science is genetics. The study of genetics comprises…

Q: A cross between a red-eyed  fruit-fly and a white-eyed  fruit-fly produced an F1with all bar-eyed…

A: Sexual dimorphism is seen in most animals and many plants; in other words, a person may be either…

Q: der(X) der(22) 22 der(X) 22 der(X) 22 First row is mother, second row is first daughter, third row…

A: The terminology "phenotype" describes an organism's visible physical features, such as its…

Q: In general, why do changes in chromosome structure or numbertend to affect an individual’s…

A: Chromosome is a compact structure of a DNA molecule wrapped around some proteins. It is generally…

Q: Let’s suppose that you have made a karyotype of a female fruit flywith red eyes and found that it…

A: As per question, there are three different eye colors X-linked alleles prevailing in the population…

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: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

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: A family has an X-linked dominant form of congenital generalizedhypertrichosis (excessive…

A: Genes are the functional unit of DNA. It contains information that is transferred from one…

Q: In Neurospora, his2 mutants require the amino acidhistidine for growth, and lys4 mutants require…

A: Neurospora is a type of a fungus that has axon like striations on its spores. The spores of the…

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: The mutant FMR-1 allele that causes fragile X syndrome is considered to be X-linked dominant…

A: Fragile X syndrome is a genetic disorder. It causes various developmental disorders that include…

Q: You are given a Drosophila female that looks wild-type but is heterozygous for mutations in tan body…

A: Three-point cross: In genetics, the three-point cross is used to determine the distance between 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: None

A: Genotype and Phenotype of Parents:Male (osk-/osk-): This male has two mutant alleles of the oskar…

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: 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: 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.…

Q: n com, male sterility is controlled by maternal cytoplasmic elements. However, the presence of a…

A: Cytoplasmic male sterility in male plants describes partial or complete sterility brought on by…

Q: Explain the rationale behind a testcross. Is it necessary for one ofthe parents to be homozygous…

A: Genetics is the study of inheritance of characters which is the heredity and the variation of the…

Q: a. In Drosophila, crosses between F1 heterozygotes ofthe form A b / a B always yield the same ratio…

A: Since you have posted a question with multiple sub-parts, we are answering only first one for you.…

Q: In an in situ hybridization experiment, a certain clonebound to only the X chromosome in a boy with…

A: In situ hybridization is a sort of hybridization in which a labelled complementary DNA, RNA, or…

Q: Duchenne muscular dystrophy (DMD) is caused bya recessive mutant allele of an X-linked gene…

A: Duchenne muscular dystrophy (DMD) is a progressive form of muscular dystrophy that results in muscle…

Q: n Figure 4-19, what would be the RF between A/a andB/b in a cross in which purely by chance all…

A: ANSWER: Recombination frequency (θ) is the frequency with which a single chromosomal crossover will…

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.