If a male bird that is heterozygous for a recessive Z-linked mutation is crossed to a wild type female, what proportion of the progeny will be mutant males?

answer

watching

681

views

For unlimited access to Homework Help, a Homework+ subscription is required.

You have 0 free answers left.
Get unlimited access to 3.8 million step-by-step answers.

Get unlimited access

Already have an account? Log in

Beverley SmithLv2

22 May 2019

Unlock all answers

Get 1 free homework help answer.

Already have an account? Log in

Related questions

In Drosophila, females are XX, while males are XY. Yellow bodies are determined by an X-linked recessive mutation Xb, while the dominant wild-type allele XB produces brown bodies. A heterozygous female is cross with a brown-bodied male to produce the F1 generation. From the F1 generation, males and females are mated at random. What genotypes and phenotypes would be expected among the progeny in the F2, and in what proportions?

Drosophila has four pairs of chromosomes: the sexchromosomes (XX in the females; XY in the males) and three pairs ofautosomes. You are studying a new mutant strain with blue eyes. Youwish to know if blue eye colour is a dominant mutation and on whichchromosome the blue eye locus can be found. When you crossa pureâbreeding female blueâeyed fly with vestigial wings andspineless bristles to a male fly with wild type eye colour, wings,and bristles, all of the F1 progeny are completely wild type. An F1male is backcrossed to a triple mutant female, producing thefollowing progeny (remember that there is no crossing over inDrosophila males):

Wild type eyes, wings, andbristles: 72 females, 69 males

Wild type eyes and bristles,vestigial: 83 females, 77 males

Wild type wings, blue eyes,spineless: 60 females, 65 males

Blue eyes, spineless,vestigial: 62 females, 58males

Is the mutation dominant or recessive?Explain.

Since you know that the locus for vestigial wings is onchromosome 2 and the locus for spineless bristles is on chromosome3, what chromosome carries the locus for blue eyes? Showyour work, including the stepâbyâstep reasoning you used to arriveat your answer.

When an F1 female is backcrossed to a triple mutant male, thefollowing 1,000 progeny are produced:

Wild type eyes, wings, andbristles: 90 females, 89 males

Wild type eyes and bristles,vestigial: 83 females, 98 males

Wild type eyes and wings, spineless:37 females, 35 males

Wild type wings and bristles, blueeyes: 36 females, 34 males

Wild type wings, blue eyes,spineless: 92 females, 88 males

Wild type eyes, spineless,vestigial: 34 females, 39 males

Wild type bristles, vestigial, blueeyes: 33 females, 37 males

Blue eyes, spineless,vestigial: 90 females, 85 males

Calculate the map distance betweenblue eye and any linked genes. Show your work

reddinosaur30

Drosophila has four pairs of chromosomes: the sex chromosomes (XX in the females; XY in the males) and three pairs of autosomes. You are studying a new mutant strain with blue eyes. You wish to know if blue eye colour is a dominant mutation and on which chromosome the blue eye locus can be found. When you cross a pure-breeding female blue-eyed fly with vestigial wings and spineless bristles to a male fly with wild type eye colour, wings, and bristles, all of the F1 progeny are completely wild type. An F1 male is backcrossed to a triple mutant female, producing the following progeny (remember that there is no crossing over in Drosophila males):

Wild type eyes, wings, and bristles:	72 females, 69 males
Wild type eyes and bristles, vestigial:	83 females, 77 males
Wild type wings, blue eyes, spineless:	60 females, 65 males
Blue eyes, spineless, vestigial:	62 females, 58 males

a. Is the mutation dominant or recessive? Explain.

b. Since you know that the locus for vestigial wings is on chromosome 2 and the locus for spineless bristles is on chromosome 3, what chromosome carries the locus for blue eyes? Show your work, including the step-by-step reasoning you used to arrive at your answer.

c. When an F1 female is backcrossed to a triple mutant male, the following 1,000 progeny are produced:

Wild type eyes, wings, and bristles:	90 females, 89 males
Wild type eyes and bristles, vestigial:	83 females, 98 males
Wild type eyes and wings, spineless:	37 females, 35 males
Wild type wings and bristles, blue eyes:	36 females, 34 males
Wild type wings, blue eyes, spineless:	92 females, 88 males
Wild type eyes, spineless, vestigial:	34 females, 39 males
Wild type bristles, vestigial, blue eyes:	33 females, 37 males
Blue eyes, spineless, vestigial:	90 females, 85 males