You are working with the genus of butterfly, Danaus, and have found new color an
ID: 274123 • Letter: Y
Question
You are working with the genus of butterfly, Danaus, and have found new color and wing mutants. Preliminary work indicates the mutant traits are recessive and autosomal. Each gene has two alleles: “R or r" for body color and "W or w" for wing surface. The red body phenotype is dominant to the blue body phenotype, and smooth wings are dominant to bumpy wings.
a) You cross a true-breeding blue-bodied, smooth-winged female with a true-breeding red-bodied, bumpy-winged male. What will be the phenotype(s) of the F1 progeny and the F2 progeny? Use Sum Rule and/or Product Rule as applicable.
b) You cross a true-breeding red-bodied, smooth-winged female with a true-breeding red-bodied, bumpy-winged male. What will be the phenotype(s) of the F1 progeny and the F2 progeny? Use Sum Rule and/or Product Rule as applicable.
Explanation / Answer
a) You cross a true-breeding blue-bodied, smooth-winged female with a true-breeding red-bodied, bumpy-winged male. What will be the phenotype(s) of the F1 progeny and the F2 progeny? Use Sum Rule and/or Product Rule as applicable.
Answer:
blue-bodied, smooth-winged female (rrWW) x red-bodied, bumpy-winged male (RRww)
F1= RrWw (all the offsprings are red-bodied, smooth-winged)
F2: RrWw x RrWw
RW
Rw
rW
rw
RW
RRWW
RRWw
RrWW
RrWw
Rw
RRWw
RRww
RrWw
Rrww
rW
RrWW
RrWw
rrWW
rrWw
rw
RrWw
Rrww
rrWw
rrww
9 red-bodied, smooth-winged
3 red-bodied, bumpy-winged
3 blue-bodied, smooth-winged
1 blue-bodied bumpy-winged
b) You cross a true-breeding red-bodied, smooth-winged female with a true-breeding red-bodied, bumpy-winged male. What will be the phenotype(s) of the F1 progeny and the F2 progeny? Use Sum Rule and/or Product Rule as applicable.
red-bodied, smooth-winged (RRWW) x red-bodied, bumpy-winged (RRww)
F1= RRWw all the offsprings are red-bodied, smooth-winged
F2: RRWw x RRWw
RW
Rw
RW
RRWW
RRWw
Rw
RRWw
RRww
3 red-bodied, smooth-winged
1 red-bodied, bumpy-winged
RW
Rw
rW
rw
RW
RRWW
RRWw
RrWW
RrWw
Rw
RRWw
RRww
RrWw
Rrww
rW
RrWW
RrWw
rrWW
rrWw
rw
RrWw
Rrww
rrWw
rrww
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