A wild legume with white flowers and long pods is crossed to one with purple flowers and short pods. The F1 offspring are allowed to self-fertilize, and the F2 generation has 301 long purple, 99 short purple, 612 long pink, 195 short pink, 295 long white, and 98 short white. How are these traits being inherited?

Respuesta :

Answer: It focuses on one trait at a time

Explanation:

The flower ratio has a 1:2:1, this is implying that an incomplete dominance with PP = Purple , PW=Pink and WW= white.

The pod length has a ratio of 3:1 and this is implying that L or long allele is dominant over l or the short allele

The result will be

Flower color= incomplete dominance; Height= complete dominance

In the given case, these traits being inherited are - the length of the pods is inherited by autosomal dominant mode and the color of the flower is inherited with incomplete dominance.

The dihybrid phenotypic ratio for two genes deconstructs into separate constituent monohybrid ratios for each of the two traits, such as the flower color and pod length, it focuses on one trait at a time.

Let us consider the length of the pod first.

  • The long pod flowers and short pod flowered are crossed, both phenotypes are present in the F2 generation.
  • The majority of the F2 are long pod flowers.
  • This is the autosomal mode of inheritance.

Let us consider the color of the flower:

  • The first cross is between the plants with purple and white flowers and we can observe

- pink, purple and white-flowered plants in the F2 generation.

  • This represents the incomplete dominance of alleles.

Here is the cross;

Parents: Long pod, white flower x short pod purple flower

AApp x aaPP

Gametes: Ap x aP

F1:   AaPp

  • All the F1 individuals are long pod purple flowers with a genotype AaBb

Thus, In the given case, these traits being inherited are - the length of the pods is inherited by autosomal dominant mode and the color of the flower is inherited with incomplete dominance.

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