Topic 8

Question 1

In crossing over Bits of maternal and paternal chromatids join together at the

Answer 1

Chiasmata

Question 2

What does crossing over give rise to

Answer 2

Genetic variation, making new combinations of alleles on chromosomes.

Question 3

What are the 3 types of mutation

Answer 3

1. Point mutation - substitution, insertion , deletion
2. Chromosomal mutation translocation - part of chromosome breaks off and attaches on a different chromosome
3. Chromosome mutation polysomy

Question 4

Changing one base for another may not affect the primary structure of a protein why’s this

Answer 4

Substitution may code for the same amino acid
Due degenerate nature of the genetic code

Question 5

What’s polygenic

Answer 5

Many genes