Seema learned the chapter heredity and evolution in her school. She was so interested in the topic that she crossed pure breed pea plants having round-yellow seeds with wrinkled green seeds to see what happens. Seema found that only A-B type of seeds was produced in the F1 generation. Later when she crossed F1 generation pea plants having A-B type of seeds by self-pollination, then in addition to the original round yellow and wrinkled green seeds, two new varieties A-D and C-B types of seeds were also obtained.

The above cross is known as :
 

Answer the following:

 What will be the ratio in F₂ generation in Mendel's dihybrid cross?

Define the heredity.

Answer the following:

Name:

The sex chromosome boys inherit from their father.

Answer the following:

Why do all gametes formed in females have only X chromosomes?

How is the sex of the child determined in human beings?

Select the correct alternative from those given below each statement and write the completed statement:

In Mendel’s breeding crosses, F₂ generation was produced through _____.

In the diagram what is the sex of (A) and (B).

How is the sex of child determined in human beings?