meiosis

Question 1

sexual reproduction

Answer 1

produces genetically different cells

Question 2

sexual reproduction definition

Answer 2

involves the fusion of male and female gametes. because there’s 2 parents, offspring contains a mixture of parents genes

Question 3

how does it work

Answer 3

1. parents produce gametes. sperm and egg
2. gametes are haploid, contains half number of chromosomes. =23
3. fertilisation - male gamete fuses with female gamete to form zygote (fertilised egg).
4. zygote does cell division and develops into embryo
5. embryo inherits features from both parents
6. fertilisation of gametes is random, produces genetic variation in offspring

Question 4

gametes produced by meiosis

Answer 4

1. before cell starts to divide, duplicates DNA, so there’s an exact copy.
2. chromosomes line up in pairs.
3. paris pulled apart.
4. each new cell with have a mixture of chromosomes.
5. in second division, chromosomes line up at centre of cell and arms of chromosomes are pulled apart.
6. 4 haploid hpgametes. each gametes has single set of chromosomes. gametes are genetically different