Which of these unwinds DNA?

ABO blood types are an example of 

The  human ____ parent determines the gender of the child.

Chromosomes first become visible in

A woman who is blood type A gave birth to a child who is blo…

Chromosomes first become visible in

The genetic make-up of an organism is known as it’s

Huntington’s Disease is caused by

A woman who is blood type A gave birth to a child who is blo…

Which of these seals together DNA?