An incompletely dominant gene controls the color of chickens so that BB produces
ID: 10447 • Letter: A
Question
An incompletely dominant gene controls the color of chickens so that BB produces black, Bb produces a slate-gray color called blue and bb produces spalhed white. A second gene controls comb shaped with dominant gene (R) producing a rose comb, and a recessive gene (r) producing a single comb. If a pure-breeding black chicken with a rose comb is mated to a splashed white chicken with a single comb. In the F2 Generation, what fraction of the offspring will be black with rose comb? Show all punnett squaresThank You
Explanation / Answer
BB --------------- black,
Bb -----------a slate-gray color called blue
and bb -------- spalhed white
dominant gene (R) ------------ rose comb,
and a recessive gene (r) -------- single comb
a pure-breeding black chicken with a rose comb is mated to a splashed white chicken with a single comb
BB RR X bb rr
BbRr-------f1 offspring
BbRr-------f1 offspring x BbRr-------f1 offspring
BR
Br
bR
br
BR
BR BR
black chicken
rose comb,
BR Br
rose comb, black chicken
BR Br
rose comb, , black chicken
BR br
rose comb,
Br
BR Br
black chicken
rose comb,
Br Br
black chicken
single comb
Br bR
rose comb,
br Br single comb
bR
BR bR rose comb,
bR Br
rose comb,
bR bR
rose comb, spalhed white
br bR
rose comb, spalhed white
br
BR br
rose comb,
br Br single comb
br bR
rose comb, spalhed white
br br single comb spalhed white
BR
Br
bR
br
BR
BR BR
black chicken
rose comb,
BR Br
rose comb, black chicken
BR Br
rose comb, , black chicken
BR br
rose comb,
Br
BR Br
black chicken
rose comb,
Br Br
black chicken
single comb
Br bR
rose comb,
br Br single comb
bR
BR bR rose comb,
bR Br
rose comb,
bR bR
rose comb, spalhed white
br bR
rose comb, spalhed white
br
BR br
rose comb,
br Br single comb
br bR
rose comb, spalhed white
br br single comb spalhed white
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