Class 10
Biology :-NCERT Solution - Heredity And Evolution
Page No 147:
Question 2:
How do Mendel’s experiments show that traits are inherited independently?
Answer:
Mendel crossed pea plants having round green seeds (RRyy) with pea plants having wrinkled yellow seeds (rrYY).
An example of dihybrid crosses
Since the F
1 plants are formed after crossing pea plants having green round seeds and pea plants having yellow wrinkled seeds, F
1 generation will have both these characters in them. However, as we know that yellow seed colour and round seeds are dominant characters, therefore, the F
1 plants will have yellow round seeds.
Then this F
1 progeny was self-pollinated and the F
2 progeny was found to have yellow round seeds, green round seeds, yellow wrinkled seeds, and green wrinkled seeds in the ratio of 9:3:3:1.
Independent inheritance of two different traits
In the above cross, more than two factors are involved, and these are independently inherited.
