Chromosomes

Question 1

How many chromosomes do we have and how many pairs?

Answer 1

46 and 23 pairs

Question 2

Cell division Stage one

Answer 2

When your cell is doing its regular job DNA is in the form of chromatin (unwound)

Question 3

Cell division Stage two

Answer 3

Just before cell division DNA copies itself (duplicate chromatin)

Question 4

Cell division Stage 3

Answer 4

At the start of cell division the duplicated DNA coils up into chromosomes

Question 5

Cell division Stage 4

Answer 5

Chromosomes pair up with their copies

Question 6

Cell division Stage 5

Answer 6

Each duplicated chromosomes consists of sister chromatids (photocopies) joined by a centromere.

Question 7

Cell division stage 6

Answer 7

One of each pair of homologous chromosomes comes from the father via the sperm cell and one from the mother via the egg cell.

Question 8

What are genes?

Answer 8

Genes are sections of chromosomes that code for specific traits.