Inheritance, variation and evolution

Question 1

Describe what happens during meiosis and compare to mitosis

Answer 1

Meiosis - produces cells with half the number of chromosomes.

Mitosis produces double the amount of chromosomes during duplication.

Question 2

Describe what happens at fertilisation

Answer 2

Fertilisation - gamete + gamete = offspring

Gamete - half amount of chromosomes so 2 gametes means the normal amount of chromosomes is restored.

Question 3

Describe how organisms are named and classified in the Linnaean system

Answer 3

It organises organisms by their charateristics and structures into the group.

Kingdom → Phylum → Class → Order → Family → Genus → Species

Binomial naming system → Genus + Species e.g. Homo sapiens

Question 4

Describe and interpret evolutionary trees

Question 5

Explain how scientific advances have led to the proposal of new models of classification, inc three- domain system