2. What are fraternal twins, and how do they normally occur?

hey!

I think your answer is

They dvelop from 2 separate eggs

Fraternal twins each come from their own egg and sperm. The term for this is dizygotic , while identical twins are monozygotic.

Explanation:

hope this helps

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.