For the next two questions, note that: -C\' = -R-purple and r = yellow, - rr epi

Question

For the next two questions, note that: -C' = -R-purple and r = yellow, - rr epistatically masks the expression of the C allele, -cc epistatically masks the expression of the R allele yellow, C purple, and c-yellow, (with C, dominant to C and c, and C dominant to c) C' epistatically masks the expression of the R allele. oportion of the Fl offspring are expected to have yellow kernels from a cross between RrC C and rr C'C? 20. What proportion of the offspring are expected to have yellow kernels from a cross between Rr cc and Rr CC?

Explanation / Answer

19.

RrC'C * rrC'C

RrC'C :Gametes will be : RC', RC , rC' ,rC

rrC'C :Gametes will be : rC' , rC ,rC' , rC

Proportion of F1 offsprings that are expected to have yellow kernels will be: 14/16 = 0.875

20.

Rrcc * RrCC

Rrcc :gametes: Rc , Rc, rc , rc

RrCC:gametes:RC,RC,rC,rC

proportion of offsprings that are expected to have yellow kernels will be : 4/16 = 0.25

rC' rC' rC rC RC' RrC'C' yellow RrC'C' yellow RrC'C yellow RrC'C yellow RC RrC'C yellow RrC'C yellow RrCC RrCC rC' rrC'C' yellow rrC'C' yellow rrC'C yellow rrC'C yellow rC rrC'C yellow rrC'C yellow rrCC yellow rrCC yellow

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