BIOL 121 Chapter Notes - Chapter 1: Cream Gene, Punnett Square, Eye Color

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Topic: determining inheritance: wild-type drosophila melanogaster have dark red eyes and smooth, tapered bristles (these are the hairs that they have on their back). A geneticist performed a series of crosses using d. melanogaster with the mutant eye colour phenotype scarlet (bright red) and the mutant bristle phenotype singed (singed bristles look like they have been burned). Cross 1: male, scarlet eyes pure-breeding female, singed bristles x pure-breeding. 82 females, wild-type eye colour and bristles (one is cross 2) 79 males, wild-type eye colour and singed bristles (one is used for. Wild-type eyes, singed bristles scarlet eyes, wild-type bristles. Based on these data, what is the mode of inheritance of the phenotypes scarlet eyes and singed bristles, respectively? (b) Predict the outcome of a cross between a pure breeding female with scarlet eyes and a pure breeding male with singed bristles. A series of crosses between the three diferent types of horses produce the following progeny:

Related Questions

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

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

Can someone please help me solve this problem, I have postedthis question twice and prof, said it was still incorrect. Pleasecan someone help me get the right answer??

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 toknow if blue eye colour is a dominant mutation and on whichchromosome the blue eye locus can be found. When you cross apureâbreeding 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, 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

1- Is the mutation dominant or recessive?Explain.

2-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? Show your work,including the stepâbyâstep reasoning you used to arrive at youranswer.

3-When an F1 female is backcrossed to a triple mutant male, thefollowing 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, 34males

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, 37males

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

4-Calculate the map distance between blue eye and any linkedgenes from the above progeny. Show your work

coffeewhale367

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

BIOL 121 Chapter Notes - Chapter 1: Cream Gene, Punnett Square, Eye Color

BIOL 121 Full Course Notes

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