Variation

Question 1

What is variation

Answer 1

Variation is all of the differences within the characteristics of a species

Question 2

What are three factors which affect variation

Answer 2

1. Meiosis
2. Crossing over
3. Non disjunction

Question 3

Describe how meiosis can affect variation

Answer 3

Random distribution of chromosomes during meiosis produces millions of variations of chromosomes within the sex cells

Question 4

Describe how crossing over affects variation. Include a diagram

Answer 4

When the homologous pairs come together, during the copying process the bottom section of the chromosome crosses over

Question 5

Describe how non-disjunction affects variation.

Answer 5

Non-disjunction causes down syndrome because, during meiosis, the 21st pair doesn’t split and resulting in an extra number of chromosomes on the left side.