18.2 - Variation In Phenotype

Question 1

The primary source of genetic variation is?

Answer 1

Mutation

Question 2

What are the 3 ways you can get phenotype variation?

Answer 2

• mutations
• meiosis
• random fertilisation

Question 3

How does mutation provide phenotype variation?

Answer 3

These sudden changes to genes and chromosomes may, or may not, be passed on to the next generation. Mutations are a main source of variation

Question 4

How does meiosis create phenotype variation?

Answer 4

This special form of nuclear division produces new combinations of alleles before they are passed into the gametes, all of which are therefore different

Question 5

How does the random fertilisation of gametes produce phenotype variation

Answer 5

In sexual reproduction this produced new combinations of alleles and the offspring are therefore different from parents. Which gamete fuses with which at fertilisation is a random process further adding to the variety of offspring two parents can produce