A cross is made between a green four-o’clock and a white four o’clock. Green chlorophyll synthesis is inherited via the chloroplasts, which are maternally inherited in this species. If the white plant provides the pollen, the expected outcome of the offspring would be

Chargaff’s studies of the base composition revealed that the amount of A equals T and the amount of G equals C. These results were important determining which structural aspect of DNA?

Which of the following demonstrate bilateral symmetry?

Which of the following features is used to characterize eukaryotic chromosomes? 

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?