In cats, yellow fur (B) is dominant to balkc fur (b), and the gene is located on the X chromosome. The heterozygous "tortoise-shell" or "calico" condition is exhibited only by the female, and is a reuslt of mosaic expression. What offspring (genotypes, phenotypes & frequencies) would you expect from the cross of a black male with a yellow female?
2006-10-27 08:19:57 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Since black is recessive, the only possibility for a black cat is homozygous bb. For yellow it can either be homozygous BB or heterozygous Bb.
Possibility 1 - BB x bb
= Bb, Bb, Bb, Bb = 100 % Yellow offsprings
Possibility 2 - Bb x bb
= Bb, Bb, bb, bb = 50% yellow and 50% black
2006-10-27 08:58:57 · answer #1 · answered by Overzealous 3 · 0⤊ 1⤋
Well, if your female is yellow...then from what you've described it would be BB...and your male would be bb. So...your offspring would be 100% Bb...this is just based on what you said....there seems like there should be something more to it...like another gene that controls expression...but, that's all I have for you based on what you gave me.
2006-10-27 08:29:30 · answer #2 · answered by Shaun 4 · 0⤊ 0⤋
well... just map it out in a punnet square. it's been a couple years since i took biology my freshman year.
2006-10-27 08:28:58 · answer #3 · answered by chelsea 2 · 0⤊ 0⤋
genotype
2006-10-27 08:46:55 · answer #4 · answered by **shell** 2 · 0⤊ 0⤋
what the...
2006-10-27 08:23:55 · answer #5 · answered by Anonymous · 0⤊ 0⤋