Evolution Of Y Chromosome

Question 1

1. Before human sex cells existed, two matched chromosomes exchange _

(300-200 MYA)

Answer 1

Bits of DNA

Question 2

Each generation of offspring swap _

Answer 2

DNA

Question 3

2. _ results in formation of SRY gene, with it, male chromosome

(200-150 MYA)

Answer 3

Random mutation

Question 4

3. As Y chromosome evolves, no longer matches X and begins _

(150-25 MYA)

Answer 4

Losing parts

Question 5

3. _ cluster around SRY gene

Answer 5

Genes triggering male traits

Question 6

4. As a result of losing parts, Y chromosome becomes smaller and _

(Present day)

Answer 6

Continues to shrink

Question 7

Y chromosome continues to shrink while x _

Answer 7

Remains same