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coffeewhale622Lv1

28 Sep 2019

In consideration of the experiments of Thomas Hunt Morgan andeye color in Drosophilia, indicate the correct genotype ofthe parents of a cross between a white-eyed female fly and ared-eyed male fly under the indicated situation.

If eye color isnot sex-linked, what isthe genotype of a white-eyed female parent?

If eye color is not sex-linked, whatis the genotype of a homozygous red-eyed male parent?

If eye coloris sex-linked, what is thegenotype of a white-eyed female parent?

If eye coloris sex-linked, what is thegenotype of a red-eyed male parent?

options:

w w

w+ w+

w+ y

wY

w+ w

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meethimanshugaurLv2

8 Apr 2023

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Lelia LubowitzLv2

28 Sep 2019

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Related questions

1. The eye color of wild-type Drosophila flies is red. Differentmutations in a single or in multiple genes lead to flies with whiteeyes. Mutations in the w gene on the X chromosome lead to whiteeyes instead of the normal red. You have isolated both a white-eyedmutation (designated W-1) that gives a dominant phenotype, and awhite-eyed mutation (designated w-2) that gives a recessivephenotype.

(a) A white-eyed male from the W-1 line is crossed to awild-type female. What color eyes will the female progeny from thiscross have?

(b) What color eyes will the male progeny from the cross in part(a) have?

(c) One of the female progeny from the cross in part (a) ismated to a white-eyed male from the w- 2 line. What fraction of thewhite-eyed progeny from this cross will be female?

2. The body color of Drosophila adult flies is regulated bymultiple genes, including the autosomal ebony gene. Ebony body (e)is recessive to the wild type (yellowish) body (e+). A second gene,which is X-linked, controls bristle shape. Normal bristle shape(f+) is dominant to the mutant forked bristles (f). A female withforked bristles that is heterozygous for the body color gene ismated with an ebony body male (his bristles are normal).

(a) What are the genotypes of the parents?

(b) Using a Punnett square, determine the expected proportionsof each possible progeny phenotype. Since there is a sex-linkedgene here, be sure to include consider sex as part of thephenotype.

3. Describe in your own words what a balancer chromosome is andwhy it is important in fly genetics (you will have to do someresearch for this one!)

mauvepug893

Please assist with the following. Please no hand-written work, but typed work and thorough explanations please including Punnett Squares. Please Ignore Sex, as these are not sex-linked traits

Dihybrid Testcrosses

In the following crosses, the wild trait is dominant and the brown trait for eye color and ebony trait for body color are both recessive. You will compare the offspring of homozygous wild flies to the offspring of heterozygous wild flies, when each is crossed with a recessive brown-eyed fly with an ebony body.

7. Perform a monohybrid cross between a wild-type female fly and a male fly with brown eyes and ebony body.
Show results for the F₁ offspring. (NOTE: You will use one of these F₁ flies in the next cross.)
ENTER DATA HERE:

PUNNETT SQUARE:

List the genotypes of the flies in this cross:

List the gametes produced by each fly in this cross:

Show the Punnett Square for the above cross.

Question: By examining the offspring, determine whether the wild-type female parent was homozygous or heterozygous for eye color and body color. How did you arrive at this conclusion?

Question: Are the F₁ offspring homozygous or heterozygous for eye color and body color? How did you arrive at this conclusion?

8. Now perform a cross between one wild-type F₁ offspring from the previous cross and a male fly with brown eyes and ebony body.
ENTER DATA HERE:

PUNNETT SQUARE:

List the genotypes of the flies in this cross:

List the gametes produced by each fly in this cross:

Show the Punnett Square for the above cross.

Question: Even though you already knew the genotype of the wild-type fly used in this cross, how can you tell by examining the offspring of this cross whether the wild-type fly in this cross was homozygous or heterozygous for eye color?

Question: What was the phenotypic ratio for the offspring resulting from this testcross?

1. In the fruit fly, Drosophila melanogaster, the normal wildtype has long wings and red eyes (both are dominant traits).Recessive forms of these genes result in vestigial wings and browneyes. A red-eyed, vesigial winged male is crossed with abrown-eyed, long winged female.

(a) Assuming each parent is homozygous for the dominant alleles,write out the cross and give the genotype and phenotype of theoffspring.

(b) If each parent is a heterozygote for the dominant alleles,what are the genotypes, phenotypes and ratios of the potentialoffspring?

2. In peas, the allele for tall plant (T) is dominant to theallele for short plants and the allele for purple flowers (P) isdominant to white flowers (p). Write out the results of thefollowing crosses and determine the phenotypic ratios for each:

(a) TtPp x TtPp

(b) Ttpp x ttpp

(d) TTpp x ttPP