Let’s suppose you were looking through a vial of fruit flies in yourlaboratory and noticed a male fly with pink eyes. What crosseswould you make to determine if the pink allele is an X-linkedgene? What crosses would you make to determine if the pink alleleis an allele of the same X-linked gene that occurs as a white allele?

Let’s suppose you were looking through a vial of fruit flies in yourlaboratory and noticed a male fly with pink eyes. What crosseswould you make to determine if the pink allele is an X-linkedgene? What crosses would you make to determine if the pink alleleis an allele of the same X-linked gene that occurs as a white allele?

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter13: Genes, Chromosomes, And Human Genetics

Section13.1: Genetic Linkage And Recombination

Problem 1SB: You want to determine whether genes a and b are linked. What cross would you use and why? How would...

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How would you set up crosses to determine if a gene is Y-linkedversus X-linked?
On average, what proportion of X-linked genes in the first individual are the same (inherited from a common ancestor) as those in the second individual? a. A male and his mother b. A female and her mother c. A male and his father d. A female and her father e. A male and his brother f. A female and her sister g. A male and his sister h. A female and her brother
A stray pregnant female cat sneaks into your open bedroom window and has four kittens in your sock drawer (*true story of how my parents got cats!). Two of the kittens are female and have black fur. Another is male and has orange fur. A third female is calico. Fur color is X-linked. What are the phenotypes of the parents? Group of answer choices Female is calico, male is black Female is orange, male is black Female is calico, male is orange Female is black, male is orange
Can someone explain this? When you cross female flies with white eyes to male flies with red eyes, you have all F1 progeny with red eyes (including both females and males) Isn't eye colour in flies are x-linked? how come all f1 offspring males and females are produced with red eyes? thanks
You are looking at a maternal effect gene that comes in 2 alleles, B (brown) is dominant and b (gray) is recessive. What are the phenotypic ratios of offspring for the following crosses? BB female x bb male bb female x BB male bb female x Bb male Bb female x Bb male
Let’s suppose that you have made a karyotype of a female fruit flywith red eyes and found that it has three X chromosomes insteadof the normal two. Although you do not know its parents, you doknow that this fly came from a mixed culture of flies in whichsome had red eyes, some had white eyes, and some had eosin eyes.Eosin is an allele of the same gene that has white and red alleles.Eosin is a pale orange color. The red allele is dominant and thewhite allele is recessive. The expression of the eosin allele, however, depends on the number of copies of the allele. When femaleshave two copies of this allele, they have eosin eyes. When femalesare heterozygous for the eosin allele and the white allele, they havelight-eosin eyes. When females are heterozygous for the red alleleand the eosin allele, they have red eyes. Males that have a singlecopy of the eosin allele have eosin eyes.You cross the XXX red-eyed female with a white-eyed male andcount the numbers of offspring. You may assume that…
An allele in Drosophila produces a “star-eye” trait in the heterozygousindividual. (It is not X-linked.) However, the star-eye allele is lethal in homozygotes. What would be the ratio and phenotypesof surviving flies if star-eyed flies were crossed to each other?
Can the Lyon hypothesis be tested in a human female who is homozygousfor one allele of the X-linked G6PD gene? Why, or why not?
A human disease known as vitamin D–resistant rickets isinherited as an X-linked dominant trait. If a male with thedisease produces children with a female who does not have thedisease, what is the expected ratio of affected and unaffectedoffspring?
Morgan first suggested that theoriginal white-eyed male had two copies of the white-eye allele. Inthis problem, let’s assume that he meant the fly was XwYwinstead ofXw Y What crosses would need to be made to rule out the possibility thatthe Y chromosome carries a copy of the eye color gene?
Let’s suppose that two different X-linked genes exist in mice,designated with the letters N and L. Gene N exists in a dominant,normal allele and in a recessive allele, n, that is lethal. Similarly,gene L exists in a dominant, normal allele and in a recessive allele,l, that is lethal. Heterozygous females are normal, but males thatcarry either recessive allele are born dead. Explain whether or notit would be possible to map the distance between these two genesby making crosses and analyzing the number of living and deadoffspring. You may assume that you have strains of mice in whichfemales are heterozygous for one or both genes.
Suppose you observed a new mutant phenotype, notched ears, that appears only in male mice. How might you go about determining whether notched ears is a Y-linked trait or a sex-limited trait? What crosses would you carry out to distinguish between these two modes of inheritance?