Positive supercoiling can

As observed in four o’clocks, a maternal inheritance pattern can be explained by

The Igf2 gene that is inherited from the mother is silenced due to imprinting. A mutation, which we will call Igf2—, is a loss-of-function mutation. If an Igf2 Igf2— mother is crossed to an Igf2 Igf2  father, what is the predicted outcome?

Assuming that 50% of the offspring are male and 50% are female, what is the probability of this couple having a son with short index fingers?

Let’s suppose that a gene exhibits a maternal effect pattern of inheritance. Which of the following statements about this gene is true?

By conducting testcrosses, researchers have found that the apple has 17 linkage groups. How many chromosomes would you expect to find in leaf cells?

Throughout this semester, there have been many examples to illustrate the issues with a lack of knowledge in relation to environmental issues or issues surrounding waste management and recycling of the general public. This issue alone is perhaps one of the largest barriers that must be overcome for the U.S. to improve rates of recycling. Recognizing the myriad of potential reasons for this lack of education, if you were tasked with the job of increasing recycling rates in the U.S., what would be the first step you would take in an effort to “educate the masses”? (3 points)

When making a karyotype, which of the following features is not commonly used to characterize eukaryotic chromosomes? 

A misaligned crossover between homologous chromosomes will produce two chromosomes in which

In mice, a true-breeding female with a normal spine is crossed to a true-breeding male with a crooked spine. All of the F1 offspring have normal spines. The F1 female offspring are then crossed to true-breeding males with a crooked spine. All of the F2 offspring have normal spines. These are observations are consistent with