Exam 9: Genetic Recombination

Suppose that a species has 42 pairs of chromosomes. Which of the following values represents the number of combinations of maternal and paternal chromosome combinations that will be sorted to the poles?

Which of the following processes is used by plants to generate gametes from gametophytes?

Which of the following is among the results of nondisjunction?

List and briefly explain the three ways in which genetic variability is increased during meiosis.

Suppose that an unknown organism from an alien planet is observed and found to have a diploid state in every other generation and to result from fertilization. The haploid state is able to grow into a gametophyte-like structure. Which life cycle strategies does this alien organism closely mimic?

Match the events listed below to the following processes. A process may be used once, more than once, or not at all. -In some species, the nuclear envelope may reform during this stage.

Describe the two stages in meiosis where the most genetic recombination occurs.

Match the events listed below to the following processes. A process may be used once, more than once, or not at all. -Tetrads align at the metaphase plate.

Which of the following is an advantage of sexual reproduction over asexual reproduction?

When researchers exposed Volvox carteri to oxidative stress, what was the result?

Suppose that an organism has the same life strategy as a maple tree. When will the synaptonemal complex be observed?

Crossing-over is limited to a single occurrence for a chromosome.

Which of the following outcomes is more likely to occur in an organism undergoing sexual reproduction than in an organism undergoing asexual reproduction?

Match the events listed below to the following processes. A process may be used once, more than once, or not at all. -This stage is always characterized by the breakdown of the nuclear envelope.

Which organisms undergo alternation between haploid and diploid generations?

For some virulent phages, fragments of the host DNA may be included in the heads as the viral particles assemble, thus providing the basis for transduction of bacterial genes during the next cycle of infection. What is the name of this mechanism?

In what way is the process of fertilization random?

Which of the following best describes the sex chromosomes?

What is the main difference between bacterial and eukaryotic transposons?

Match each term with its correct definition. -transposable elements