X and Y chromosomes and genetic screening - CCEA

1

Why does a person need to have two copies of the cystic fibrosis allele to have cystic fibrosis?

2

Which statement about chromosomes and human gender is correct?

3

During fertilisation what are the chances of a male zygote being produced?

4

Which sex chromosome contains more genes because it is larger?

5

Which gender has more haemophilia sufferers?

6

Individuals with Down syndrome have how many chromosomes?

7

What liquid is tested during amniocentesis?