Assertion (A): Centrosome is the point of attachment of two chromatids of a chromosome.

Reason (R): Centrosome initiates and regulates the process of cell division as it helps in the formation of spindle fibres.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Meiosis is the kind of cell-division which occurs during gamete formation in the gonads.

Reason (R): During meiosis, chromosome number remains the same in parent cell and daughter cells which is very significant to maintain the identity of the organism.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Karyotype is the division of nucleus during cell-division.

Reason (R): Karyon means nucleus and type explains the number, shape and size of the chromosome.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.

Assertion (A): Dominant alleles can express themselves only in homozygous condition.

Reason (R): Dominant alleles support recessive alleles and allow them to express, even in heterozygous condition.

1. Both A and R are True
2. Both A and R are False
3. A is True and R is False.
4. A is False and R is True.