A recessive allele causes condition X. A heterozygous man and homozygous recessive woman want to have a child. Use a punnet square to determine the probability that the child will have condition X.

Father genotype: HhMother genotype: hh(DRAW PUNNET SQUARE ON WHITEBOARD)Child with condition X will have genotype hh.Probability = 0.5 (50%).

AS

Related Biology GCSE answers

All answers ▸

Use your knowledge of the carbon cycle to indicate the effect of deforestation on the carbon dioxide concentration in the atmosphere, and the effect this change will have on the environment.


In terms of ecological pyramids, how can pyramids of numbers sometimes be a different shape from pyramids of biomass, even for the same food chain?


What is the difference between passive and active immunity?


Explain the process of osmosis and give an example of where this occurs (5 marks).