In order for a male to express a recessive sex-linked trait that is located on x chromosomes, he must have:

an additional recessive allele on his y chromosome

two recessive autosomal alleles

an inactive allele

one recessive allele on his x chromosome
!

What does all of the organ system in a human form

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.