Meiosis

Question 1

What does meiosis produce

Answer 1

Gametes which only have half the original number of chromosomes

Question 2

Why do gametes only have 1 copy of each chromosome

Answer 2

When gamete fusion takes place you have the right amount of chromosomes again

Question 3

What happens in the first division of meiosis

Answer 3

Genetic info is duplicated to from 2 armed chromosomes and the chromosomes arrange themselves into pairs and like up in the centre
The pairs are then pulled apart and 2 new cells are made which both have one copy of each chromosome some father and mother

Question 4

What happens in the second division of meiosis

Answer 4

The chromosomes line up again in the centre of the cell and the arms of the chromosomes are pulled apart
So you get 4 gametes each with a single set of chromosomes

Question 5

What happens to the cell that forms once the two gametes have fused together in fertilisation

Answer 5

The cell will divide by mitosis to produce lots of new cells in the embryo
These cells will start to differentiate to make up a whole organism

Question 6

Advantages of asexual reproduction

Answer 6

Variation is produced in offspring this increases the chance of species surviving a change in environment and have a advantageous characteristic - natural selection
Selective breeding

Question 7

Asexual reproduction advantages

Answer 7

Only 1 parent
Asexual uses less energy than sexual
It’s faster
Clones can be produced

Question 8

What organisms can reproduce asexually and sexually

Answer 8

Malarial parasites
Fungi
Plants

Question 9

Where does a parasite produce sexually and asexually

Answer 9

Sexually > in mosquito

Asexually > in human

Question 10

What can be produced sexually and asexually in fungi

Answer 10

Spores