DNA Quiz 2

Humans have ​ (a)   pairs of chromosomes.

• 23
• 46
• 2
• 26

Mom will give 23 chromosomes in her ​ (a)   and dad will give 23 chromosomes in his ​ (b)   .

• egg
• sperm
• DNA
• baby cell

Can identical twins be 2 girls?

• Yes

• No

Can identical twins be 2 boys?

• Yes

• No

Can identical twins be 1 girl and 1 boy?

• Yes

• No

Fraternal twins come from ____ different eggs that are fertilized by 2 different sperm.

Can fraternal twins be 2 girls?

• Yes

• No

Can fraternal twins be 2 boys?

• Yes

• No

Can fraternal twins be 1 girl and 1 boy?

• Yes

• No

Every gene occurs in pairs called _______.

• chromosomes

• traits

• genes

• alleles