Patterns of Inheritance

Question 1

outline how the environment can cause phenotypic variation w examples

Answer 1

Genotype could code for something(chlorophyll) but the environment could stop the expression of it. Chlorotic plants don’t produce chlorophyll(but code for it) due to lack of sunlight/ mineral deficiencies/virus infection.

Question 2

Give example of environment causing phenotypic variation in animals

Answer 2

Body mass-

Animal’s body mass(obesity/underweight) can be affected by the environment.

quality/quantity of food
Quantity of exercise
Presence of disease

Question 3

State 2 ways genes can cause phenotypic variation.

Answer 3

sexual reproduction

mutations

Question 4

state 2 ways sexual reproduction can cause variation

Answer 4

• meiosis

- random fusion of gametes at fertilisation