Cell Division And Sex Determination

Question 1

Definition of mitosis

Answer 1

Cell division that produces two daughter cells that have the same number of chromosomes
so are genetically identical

Question 2

Role of mitosis in growth and repair and replacement

Answer 2

It is a type of cell division, produces two identical cells to parent cell.

Question 3

Meiosis definition

Answer 3

Cell division that produces four daughter cells , known as gametes.
Which have a single set of chromosomes
Each with different combinations of parent cells.

Question 4

What is the roll of meiosis in reducing the chromosome number so that the full chromosome complement is restored at fertilisation

Answer 4

At fertilisation the nuclei of sperm and egg join to form zugote.
The zygote contains 23 pairs of chromosomes.
23 single from sperm and from egg.
So creates 46!
So complete set of chromosomes from each parent

Question 5

What is asexual production

Answer 5

One parent produces identical offsring

Question 6

What is sexual reproduction

Answer 6

Two parents and offspring genetically different leading to increased variation

Question 7

In most mammals what are females / males

Answer 7

F - XX

M - XY