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Question

How do Mendel's experiments show that traits are inherited independently?


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Solution

Mendel crossed pea plants having round green seeds (RRyy) with pea plants having wrinkled yellow seeds (rrYY).

Since F1 plants are formed after crossing pea plants having green round seeds and pea plants having yellow wrinkled seeds, F1 generation will have both these characters in them. However as we know that yellow seed color and round seeds are dominant characters, therefore the F1 plants will have yellow round seeds.

Then this F1 progeny was self-pollinated and the F2 progeny was found to have yellow round seeds, green round seeds, yellow wrinkled seeds, and green wrinkled seeds in the ratio 9:3:3:1.

Independent Inheritance of two different traits:

During reproduction, the factors determining the traits get separated into reproductive cells or gametes, and reunite during fertilization.
The pair of alleles segregate from each other during gamete formation so that only one allele will be present in each gamete.

When Mendel crossed a pea plant with yellow colour, round seed with green colour wrinkled seed were two parental and two recombinant phenotypes. The parents were yellow, round and green wrinkled. While the recombinants were yellow wrinkled and green round. This result explains that the traits are separate from their parental combinations and are inherited independently.


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