A diploid plant is a dihybrid for flower color (gene “R”) and leaf size (gene “L

Question

A diploid plant is a dihybrid for flower color (gene “R”) and leaf size (gene “L”). Its phenotype is red flowers and large leaves. This plant is crossed to a tester plant (which has white flowers and small leaves). The progeny is as follows:

23 Red, large

25 White, small

230 Red, small

235 White, large

What can be concluded about the linkage relationship of the loci in the dihybrid parent?

A) Genes R and L are unlinked

B) The dihybrid parent’s genotype is RL/rl

C) The dihybrid parent’s genotype is Rl/rL

D) Genes R and L are linked and 9 map units apart

E) C, and D

Explanation / Answer

E. C, and D

It is given that a diploid plant is a dihybrid for flower color (gene “R”) and leaf size (gene “L”) and it is crossed with a tester plant. The genotype of the diploid plant is Rr Ll or Rl/rL.

The genes are linked and the distance between R and L = number of recombinant progeny*100/ total number of progeny. = (23+25) * 100/ 513 = 9.3 or approximately 9 map units.

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