Biology 1201A Lecture Notes - Lecture 4: Allosome, Punnett Square, Y Chromosome

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violetmole448

9 Apr 2016

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One or more chromosomes that differ in males vs females. Females have two copies of x, males have x and y. Y is partly homologous to x, but its also partly not (stunted, shorted, therefore not all genes can be in the same places) There are some x genes on the y chromosome and some that are not, and there are some y genes that the x chromosome does not have. Reciprocal cross will result in the same results in a punnett square, but in the findings all of the males resulted with white eyes and the females with red eyes. Which does not match up with the predicted results, this is because this gene locus is on the sex chromosomes. Therefore, eye colour is an x related gene in a region that is not homologous with the y chromosome (no eye colour loci on the y chromosome)

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

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Biology 1201A Lecture Notes - Lecture 4: Allosome, Punnett Square, Y Chromosome

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