Genetics and Evolution (AHL)

What is the primary biological significance of meiosis in sexually reproducing organisms?

Which process occurs during Prophase I and results in the exchange of genetic material between non-sister chromatids?

If a parent cell has a diploid number of $2n = 40$, how many chromosomes will be present in each daughter cell at the end of Meiosis II?

During which phase of meiosis does the process of crossing over occur, leading to the formation of recombinants?

Human skin color is an example of polygenic inheritance. Which of the following is a characteristic of traits governed by polygenic inheritance?

In a dihybrid cross between two pea plants with the genotype $SsYy$ (where $S$ is smooth, $s$ is wrinkled, $Y$ is yellow, and $y$ is green), what is the expected probability of obtaining an offspring that is wrinkled and green, assuming the genes are unlinked?

If the frequency of a dominant allele ($P$) in a stable gene pool is 0.7, what is the frequency of the recessive allele ($q$)?

In a certain population of birds, individuals with very small beaks cannot crack seeds, and individuals with very large beaks are too heavy to fly efficiently. Over time, the population settles on a medium beak size. What type of selection is this?

Three populations of a plant species bloom at different times of the year: one in early spring, one in mid-summer, and one in late autumn. Which type of reproductive isolation does this represent?