Choose the correct answer:
Which of the following is not a direct conclusion that can be drawn from Mendel's Experiment?

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Only one parental trait is expressed

Two copies of each trait are inherited in sexually reproducing organisms

For a recessive trait to be expressed, both copies should be identical

Natural selection can alter the frequency of an inherited trait.

answer is D.

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Detailed Solution

The conclusions drawn by Mendel based on his experiments on Pea plants resulted in the laws of inheritance are:

1. Law of dominance: A cross between contrasting alleles of the same trait will result in progeny (F1) expressing only one trait, that is, dominant.

2. Law of purity of gamete: Every sexually reproducing organism produces gametes which are true for the traits they carry, that is, carry one copy of every trait. The fusion of male and female gametes results in two copies in the progeny.

3. A recessive trait is always expressed in homozygous condition - for example, tt, rr, etc

Natural selection is a concept put forth by Charles Darwin, where nature selects certain traits that are better adapted for survival over others, be it recessive or dominant. Therefore, can alter the frequency of an inherited trait.

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