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Describe an adaptive feature as an inherited feature that helps an organism to survive and reproduce in its environment
1 Answer Describe gene mutation as a random change in the base sequence of DNA
1 Answer State that ionising radiation and some chemicals increase the rate of mutation
1 Answer State that mutation is the way in which new alleles are formed
1 Answer Describe mutation as genetic change
1 Answer State that discontinuous variation is usually caused by genes only and continuous variation is caused by both genes and the environment
1 Answer State that discontinuous variation results in a limited number of phenotypes with no intermediates; examples include ABO blood groups, seed shape in peas and seed colour in peas
1 Answer State that continuous variation results in a range of phenotypes between two extremes; examples include body length and body mass
1 Answer Use genetic diagrams to predict the results of monohybrid crosses involving codominance or sex linkage and calculate phenotypic ratios
1 Answer Describe red-green colour blindness as an example of sex linkage
1 Answer
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