You are working with a farmer who has two varieties of true-breeding corn plants

Question

You are working with a farmer who has two varieties of true-breeding corn plants. The Durham variety has dominant alleles for short stature (S), yellow leaf colour (Y) and crinkled leaves (C). The UOIT variety has the recessive alleles for all three genes; tall stature (s), green leaf colour (y), and smooth leaves (c). The farmer has mapped the genes and tells you that they are linked as shown below:

SYC

S _________Y__________________C s to y= 7 m.u. Y to C= 18 m.u

The farmer has produced an F1 hybrid between the two varieties and has backcrossed this to the UOIT variety. Assuming that there is no interference, he wants you to tell him:

The proportion of the backcrossed progeny that will be phenotypically identical to the Durham variety for all three traits.

The proportion of the backcrossed progeny that will be phenotypically identical to the UOIT variety for all three traits.

The proportion of the backcrossed progeny that will have the stature and leaf texture of Durham variety but the leaf colour of the UOIT variety.

The proportion of the backcrossed offspring that will have the stature and leaf colour of Durham variety but the leaf texture of the UOIT variety.

Explanation / Answer

genotype of F1 hybrid :- SsYyCc {one gamete from each parent}

Backcross :-

1/8 progeny(SsYyCc) will be phenotypically identical to Durham(SSYYCC) variety for all 3 traits.

1/8 of progeny will be phenotypically identical to UOIT variety for all three traits.

1/8 will have stature and texture of Durham but leaf colour of UOIT variety.

1/8 of offsprinf will have stature and colour of Durham variety but leaf texture of UOIT variety.

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