Two parents who do not have sickle cell anemia have a child that has the disease.  The parents are both:

If mRNA is complementary to the DNA template strand and the DNA template stand is complementary to the DNA non-template strand, why are base sequences of mRNA and the DNA non-template strand not identical? Could they ever be?

New drugs are being developed that decrease DNA methylation and prevent the removal of acetyl groups from histone proteins. Explain how these drugs could affect gene expression to help kill tumor cells.

Vertebrate cells possess a protein that binds to clusters of 5-methylcytosine and ensures the gene will stay in the “off” position. This control of gene regulation is a result of

The most recent techniques developed in the biological sciences allow the manipulation of DNA with the ultimate goal of intervening directly with the ________ fate of organisms.

Some hereditary and age-related diseases are caused by translation errors. Explain why an error in translation may cause disease.

The most recent techniques developed in the biological sciences allow the manipulation of DNA with the ultimate goal of intervening directly with the ________ fate of organisms.

Males of many marsupial species have forked penises that are incompatible with the anatomy of female placental mammals. What type of isolating mechanism does this represent?

In a small population of cockroaches living in your kitchen, only a few roaches mate in one year.  This can lead to random changes in allele frequency in the population through ________

In the southeastern U.S., two species of wild lettuce (Lactuca) do not usually form hybrids, because they bloom at different seasons. The means of isolation appears to be