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1a. For example you mate an orange eye fly mutant with a white eye fly mutant and you get all wild type offspring. Do the results from the cross indicate that the mutations for OE and WE are on the same gene or different genes?

1b. A cross between white eye fly mutant and wild type occurs. A male and female are selected from the F1 generation to mate to create F2 generation. In F2 generation: 75% are wild type and 25% are white eye. Do these findings support the answer from 1a? Why or why not?

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Jamar Ferry
Jamar FerryLv2
28 Sep 2019

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Related questions

ou are experimenting with the mutation in fruit flies that causes the white eye phenotype. You are predicting this gene is recessive and linked on the X chromosome. If you have a P generation that consists of a male with white eyes and mate this with a female that has red eyes. The F1 generation all have red eyes. These F1 flies are allowed to mate with each other and you collect the offspring. If you collect 60 male flies, how many of these males would you predict have white eyes? Enter an expected number of male flies, not a percentage. Assume equal survival of red- and white-eye fly embryos.

Imagine that you have been asked to repeat T.H. Morgan’s classic experiments on the white eye mutant of Drosophila. Your plan was to cross flies with different eye phenotypes (white vs red), score F1 progeny flies for eye phenotypes, allow sibling flies to mate, and score F2 progeny. Unfortunately, you never got around to doing the experiment, and instead had to write up what you would have expected to find if you had not procrastinated. Note here what number of flies of each type you would have found if your experimental results had perfectly matched your expectation. Assume that you scored 100 progeny flies from each type of mating.

A) From cross of white eye female with red eye male

B) From cross of white eye male with red eye female

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?

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