in rats the gene that is autosomal and the allele for pink t

in rats, the gene that is autosomal and the allele for pink tow pads (T) is dominant over the allele for black tow pads (t). The gene for ear shape is X-linked with the allele for round ears (X^E) is dominant over the allele for pointy ears (X^e). You cross a female rat with pink toe pads and pointy ears to a male rat with black toe pads and round ears. The F1 progeny all have pink toe pads. a. What are the genotypes of parental generation? Female: ? Male: ? b. what is the genotype and phenotypes of the F1 progeny? c. what types of gamete could each of the F1 progeny produce?

Solution

Answer

a).

A female rat with pink toe pads and pointy ears=TT X^eX^e

A male rat with black toe pads and round ears = tt X^EY

b).

TT X^eX^e X tt X^EY------parents

F1: Female---Pink toe and round ears(TtX^EX^e )

Male: Pink toe and pointy ears (TtX^eY)

c).

Female (TtX^EX^e ) progeny produces TX^E, TX^e, tX^E & tX^e gametes.

Male (TtX^eY) progeny produces TX^e,TY, tX^e &tY gametes.