Assume that the length of wheat leaves is controlled by three loci, each with tw

Question

Assume that the length of wheat leaves is controlled by three loci, each with two alleles: L and I, Wand w, H and h. Determine the differences in leaf length between two homozygous strains of wheat. Assume each allele contributes equally to the length of the plant leaves. One homozygous strain, Il ww hh, has leaves that are 100 mm in length, and the other strain, LL WW HH, has 220 mm leaves. The two homozygous strains are crossed, and the resulting F1 are selfed to produce F2 progeny. What length will the leaves of the LIww HH genotype plant be? Number What proportion of the F2 progeny will have the same phenotype as the LI ww HH genotype? Number

Explanation / Answer

1. To determine the length of the leaves for the Ll ww HH, first determine the total number of dominant alleles, multiply the number of dominant alleles by the length that each dominant allele adds to the baseline leaf length. Add the additive value to the baseline leaf length.

Length of LLWWHH is 220mm, since all alleles contribute equally to the length of plant leaves.

Ll ww HH has 3 dominant alleles, which will contribute about 110mm of leaf length.

2. The F1 progeny is Ll Ww Hh and when it is selfed

The proportion of Ll ww HH genotype will be 0.3

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