If a defective gene is on an X chromosome, which parent will pass the gene to a son?

A. Only the father

B. Either the mother or father

C. Only the mother

D. Neither: A son cannot inherit a gene from an X chromosome

When did the red cross begin to screen for hiv in their blood supplies?

What types of reproductive isolation may have been important in galápagos finch speciation? a. geographic isolation and temporal isolation b. geographic isolation and behavioral isolation c. behavioral isolation and temporal isolation d.

Give some examples of potatoes which are hardy against diseases

Explain how infant botulism is different than foodborne botulism.

What word does the arrow in the chemical equation for photosynthesis stand for?

A cell spends most of its life in which stage of the cell cycle? a. metaphase b. telophase c. anaphase d. prophase e. interphase

In which direction are new nucleotides added during replication?

Is selective cutting more beneficial than clear cutting

The sustained massive use of pesticides in farming has two effects that are especially pernicious. First, it often kills off the pests' natural enemies in the area.

A species of fish known as Astyanax mexicanus lives in deep underground caves off the coast of Mexico. It is virtually blind. The same fish lives near the surface and has fully functioning eyes.