Heredity — Class 10 Science PYQs

A cross made between two pea plants produces $50\%$ tall and $50\%$ short pea plants. The gene combination of the parental pea plants must be

Q. Nos. 17 to 20 are Assertion – Reason based questions :
These questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below :

Assertion (A) : Human female has a perfect pair of sex chromosome.
Reason (R) : Sex chromosome contributed by the human male in the zygote decides the sex of a child.