Biology: Which best summarizes the concept of natural selection? A. The fittest organisms survive and reproduce. B. A mutation always makes a species fitter. C. An organism will always adapt to its environment. D. An organism will always mutate to survive.

Which best summarizes the concept of natural selection?

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26.01.2020

Assuming a diallelic gene and complete dominance, the percentage of the offspring that is expected to have only knobless chromosomes is 50%

Available data:

Trait presence absence of knobsPlant 1: One member of each of two pairs of homologs in a corn plant has a knobPlant 2: knobless plant

We will assume complete dominance, and that the presence of knobs is the dominant trait.

We will name the dominant allele A, and the recessive allele a.

Plant 1 seems to be heter0zyg0us for the trait, while plant 2 is h0m0zyg0us.

Cross: Plant 1 with Plant 2

Parentals) Aa x aa

Gametes) A a a a

Punnett square) A a

a Aa aa

F1) 50% of the progeny is expected to be heter0zyg0us, Aa, expressing knobs

50% of the progeny is expected to be h0m0zyg0us recessive, aa, having knobless chromosomes.

The percentage of the offspring that is expected to have only knobless chromosomes is 50%.

You can learn more about complete dominance at

link

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