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The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant
that has green pods. Green pods are the dominant trait. The flowchart is missing the labels that describe the traits.
A
D
C
E
In which squares should the phrase "Green pods" appear?
O A and D only
OB and E only
O A, C, and D only
O A, B, C, D, and E

Sagot :

marianaegarciaperedo

The inheritance pattern of pods color in pea plants is complete dominance. H0m0zyg0us dominant and heter0zyg0us plants have green pods. Option C) A, C, and D.

What is complete dominance?

When the dominant allele completely masks the recessive allele, we talk about complete dominance.

This is the case of individuals that are heter0zyg0us for a particular gene and express the dominant trait. The dominant allele is hiding the expression of the recessive allele.

When you cross an individual who is h0m0zyg0us dominant with an individual who is h0m0zyg0us recessive, the whole progeny among the first generation -F1- will express the dominant phenotype since they are heter0zyg0us for this trait.

However, if you let individuals from the F1 cross with each other, the second generation -F2- will be composed of individuals expressing the dominant and the recessive phenotypes. This is because some individuals are h0m0zyg0us recessive and can express the recessive trait.

According to this information, and based on the attached flowchart, we can assume that,

  • Parentals ⇒ A (gray square) and B (white square)
  • F1 ⇒ C (gray square)
  • F2 ⇒ D (gray square) and E (white square)

Since the F1 is completely gray, we can assume this color identifies the dominant phenotype (green pods).

The cross was performed between plants with yellow and green pods, so they must be h0m0zyg0us individuals (dominant and recessive) and the whole F1 must be heter0zyg0us for the trait. So,

A ⇒ h0m0zyg0us dominant because it is gray ⇒ green pods

B ⇒ h0m0zyg0us recessive because it is white ⇒ yellow pods

C ⇒ heter0zyg0us because it is gray and the product of A x B ⇒ green pods

Now, the F2 is composed of D and E which represent plants with yellow and green pods. This means that there are h0m0zyg0us recessive individuals, and the recessive trait -yellow pods- can be expressed again among the second generation.

D ⇒ h0m0zyg0us dominant and heter0zyg0us ⇒ green pods (gray square)

E ⇒ h0m0zyg0us recessive ⇒ yellow pods (white square)

Now,  the phrase "Green pods" should appear i all gray squares. These are A, C, and D.

Option C is correct. A, C, and D only.

You can learn more about complete dominance at

brainly.com/question/1953851

#SPJ1

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