What must be true for a male individual to be a carrier of a y-linked recessive allele?
a. the gene has no other alleles.
b. the gene is only expressed in females.
c the gene is silenced on the y chromosome.
d. the gene is also found on the x chromosome.

5) these are organisms where the genetic material is not bound by a nucleus. they are usually unicellular.

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi