In snapdragons, red flower color is incompletely dominant to white flower color;

Question

In snapdragons, red flower color is incompletely dominant to white flower color; the heterozygote has pink flowers. Normal flowers are completely dominant to peloric-shaped ones; and tallness is incompletely dominant to dwarfness; the heterozygote has intermediate height. The three gene pairs segregate independently. If a homozygous red, tall, normal-flowered plant is crossed with a homozygous white, dwarf, peloric-flowered one, what is the proportion of the F2 that will resemble the F1 in appearance?

A) 18/64
B) 8/64
C) 3/64
D) 12/64
E) 27/64 When I worked this problem, my proportions for the F2 cross are 1/2 pink, 1/4 tall, and 3/4 normal. My key is telling me this is incorrect! What am I doing wrong? E) 27/64 When I worked this problem, my proportions for the F2 cross are 1/2 pink, 1/4 tall, and 3/4 normal. My key is telling me this is incorrect! What am I doing wrong?

Explanation / Answer

Given characters are RR- red flowers Rr- pink flowers rr- white flowers NN-normal shaped Nn- normal shaped nn- peloric shaped TT- tall Tt- intermediate height tt- dwarf In the F1 generation the plants that are crossed are RRNNTT * rrnntt The F2 generation will give 64 progeny in which only 3 will resemble the F1 plants. They are RRNNTT(red, normal and tall), RRNNTt(red, normal and tall) and rrnntt (white, peloric and dwarf) so, it is 3/64

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