A woman with type A blood has parents who are both type AB and a husband who is a type B. What is the probability that her first child will be a son with type O blood?

Researchers found the strain of E. coli that had mismatched bases ratio one hundred times higher than normal. Which of the following is the most likely cause of these results?

The unlettered circle at the top of the following figure shows a nucleus of a parental cell. Which of the five circles below it represents a nucleus of the healthy gamete that could be produced in Meiosis? [Meiosis] Which of the five circles below it represents a nucleus of a healthy daughter cell in the end of Mitosis? [Mitosis]  

Homologous chromosomes have

How many unique healthy gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

During the formation of gametes, specialized germs cells first divide mitotically and then they undergo meiosis. The following graph is representing DNA content of male testicular cell during sperm formation. In the graph, DNA replication during S phase is represented by which numbered part(s) of the cycle?[Sphase] In the graph, G1 is represented by which part of the cycle?[G1phase] Based on the graph, how much DNA is present in a resulting human sperm? [DNAmass]    

Which of the following cell types is likely to demonstrate the lowest level of telomerase activity?  

Radiation therapy for cancer works because a cell’s DNA is exposed during mitosis and most vulnerable to damage from radiation. Because cancer cells are uncontrollably undergoing mitosis, they die when exposed to the treatment. The common side effects of radiation treatment are hair loss and vomiting. What does this imply?

In the diagram of the process of DNA replication, the black boxes labeled D and E are [DE]. The strand labeled B is the [B].  

In E. coli, you found a deleterious mutation in a gene called “dnaB” that codes for enzyme helicase. This mutation leads to a non-functional protein. Which of the following would you expect as a result of this?