When is a recessive allele expressed in offspring? •when the offspring is heterozygous
•when the offspring has both dominant alleles
•when parents have no recessive alleles
•when two copies are present

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13