GENETIC VARIATION, GENES AND ALLELES

Question 1

Name the 3 sources of genetic variation

Answer 1

1. Crossing over
2. Independent assortment
3. Random fusion of gametes

Question 2

When does crossing over occur

Answer 2

Prophase 1 of meiosis

Question 3

When does independent assortment occur

Answer 3

Metaphase 1 of meiosis

Question 4

Describe crossing over

Answer 4

Changes the combination of alleles of one or more genes that are carried on a chromosome and therefore the overall combination of alleles.
Results in genetic variation between gametes produced by an individual

Question 5

Describe independent assortment

Answer 5

Random orientation of bivalents results in many different combinations of chromosomes and therefore alleles.
Results in genetic variation between gametes

Question 6

describe the random fusion of gametes

Answer 6

Any male gamete produced can fuse with any female gamete.
Results in genetic variation between resulting individual organisms

Question 7

How many copies of each chromosome per cell

Answer 7

2

Question 8

What is it called when there are 2 dominant different alleles in the same gene

Answer 8

Co-dominant