" A male honeybee has 16 chromosomes whereas the female bee has 32" Give reason.

At the end of S phase each chromosome has

Swiss cheese has large holes in it'-Give reasons.

While examining the mitotic stage in a tissue, one finds, some cells with 16 chromosomes and some, with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number. Do you think cells with 16 chromosomes could have arisen from cells with 32 chromosomes or vice versa?

If an onion has 16 chromosomes in its leaf cell, how many chromosomes will be there in its root cell and pollen grains.

A glass of water has an ice cube floating in water. The water level just touches the rim of the glass. Will the water overflow when the ice melts ? Give the reason.

When a microspore mother cell with 20 chromosomes undergoes meiosis, each of the four resulting cell has:

A vernier calipers has 1mm marks on the main scale. It has 20 equal divisions on the Verier scale which match with 16 main scale divisions. For this Vernier calipers, the least count is