Determine the probability of a couple having a child with a widow's peak if the conditions are as follows: The gene for widow's peak follows strict autosomal dominant-recessive inheritance. Widow's peak (W) is dominant, and no widow's peak (w) is recessive. The genotype of the mother is Ww, and the genotype of the father is ww.

Which pattern of inheritance includes examples of codominance?

a. Autosomal dominant and recessive traits

b. Multiple-allele traits

c. Sex-linked traits

d. Polygenic inheritance

Elise is a freshman college student taking Introduction to Biology. In lab, she is asked her parents' blood types to complete a Punnett square. She knows that she has type A blood and that her mother has type B, but she does not know her father's blood type. Elise's lab partner assures her that she can figure out her father's blood type just by knowing her own and her mother's. Is her lab partner correct? Explain why or why not.

Certain diseases are transmitted via mitochondrial DNA. Which cell types do you think would be most affected by such diseases, and why?