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Assume that the length of wheat leaves is controlled by three loci, each with two alleles: L and l, W and 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, ll 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. 1. What length will the leaves of the ll WW HH genotype plant be? 2. What proportion of the F2 progeny will have the same phenotype as the II WW HH genotype?

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marianaegarciaperedo

Polygenic heritability is the expression of a trait by many genes interaction. 1) 180mm. 2) 15/64

What is polygenic heritability?

Polygenic heritability occurs when a trait results from the interaction of many genes.

Individuals are grouped in categories that depend on how genes were intercrossed and distributed during meiosis.

   

In this example, there are three diallelic genes. We know that

  • all alleles add the same length to the leaves,
  • the largest leaves are the homozygous dominant ones (AAWWLL⇒ 220mm),
  • the shortest leaves are the homozygous recessive ones (aawwll⇒ 100mm).

By looking at the difference between lengths (220 - 100 = 120mm), we might say each dominant allele adds 20 mm to the leaves (120mm/6alleles = 20mm).

Plants llWWHH have 4 dominant alleles, meaning their leaves' length is 180 mm.

Among the F2, 15/64 individuals are expected to have 180 mm leaves.

You can learn more about Polygenic heritability at

https://brainly.com/question/16189956

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