STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

Mental retardation in man associated with sex chromosomal abnormality is usually due to:

Given below are a few statements regarding somatic hybridization. Choose the correct statements:

1. protoplasts of different cells of the same plant are fused.
2. protoplasts from cells of different species can be fused.
3. treatment of cells with cellulase and pectinase is mandatory.
4. the hybrid protoplast contains characters of only one parental protoplast.

In human beings, the colour of skin is controlled by

Stopage of reproduction in an organism by creating hurdle in its biology or physiology or its distruction by use of another organism is known as

The menstrual cycle in normal adult woman is of

Recessive characters are expressed

The primates nearest to humans in the evolutionary line is