Male fruit flies with dumpy body shape and wild type eyes are mated to females w
ID: 222266 • Letter: M
Question
Male fruit flies with dumpy body shape and wild type eyes are mated to females with wild type body shape and pink eyes. The dumpy body shape and pink eye color mutations are both recessive. The body shape gene and the eye color gene are both located on autosomes and are independently assorting (not on the same chromosome). a. Assign letter designations to each gene and the alleles. Write out the cross and the expected F1 offspring. b. If the F1 hybrid female fruit flies are mated to tester males with dumpy body and pink eyes, what phenotypes and ratios are expected in the F2 generation?Explanation / Answer
Answer:
Dumpy body= dd; Wild body= DD or Dd
Pink eyes= pp; Wild eyes= PP or Pp
Dumpy body shape and wild type eyes x wild type body shape and pink eyes----Parents
ddPP x DDpp--------------------------P
DdPp (Wild body and wild eyes) ---F1
All F1 progeny have wild body and wild eyes.
DdPp x ddpp ----Test cross
F2 generation
dp
DP
DdPp (Wild body and wild eyes, 25%)
Dp
Ddpp (Wild body and pink eyes, 25%)
dP
ddPp (dumpy body and wild eyes, 25%)
dp
ddpp (dumpy body and pink eyes, 25%)
dp
DP
DdPp (Wild body and wild eyes, 25%)
Dp
Ddpp (Wild body and pink eyes, 25%)
dP
ddPp (dumpy body and wild eyes, 25%)
dp
ddpp (dumpy body and pink eyes, 25%)
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