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(a) You cross a brown-skinned sow (female) with a white-skinned boar (male). One third of the...

(a) You cross a brown-skinned sow (female) with a white-skinned boar (male). One third of the piglets are brown females, 1/3 are white females and 1/3 are white males. The brown gene is:

Group of answer choices (select all that apply).

a. dominant to white.

b. sex linked.

c. codominant with white.

d. None of these answers are correct

e. recessive to white.

f. lethal when hemizygous.

(b)Given the results from the cross immediately above, do you think you could carry out the reciprocal cross (brown male X white female) and why or why not? If it is possible, what would you expect for phenotypic ratios in the progeny?

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Homework Answers

Answer #1

a)

b. Sex linked
f. Lethal when hemizygous

The female parent is heterozygous from the brown gene (Xb Xw) and the boar is white skinned (Xw Y).

The progeny produced from this cross is Xb Xw (Brown female), Xw Xw(White female), Xb Y (Brown Male), and Xw Y(White male). However, the Brown males (hemizygous for the brown allele) perish, only leaving the three other genotypes.

b)

Given this information, the reciprocal cross would not be possible, as male pigs (boars) that have inherited this allele will not be survive to adulthood.

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