Which of the following events define the proterozoic eon?

The deserts of the sahara and australia are associated with

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has