Louisiana State University BIOL 1201 Chapter 13 1)A sexual reproduction____________________

Louisiana State University

BIOL 1201

Chapter 13

1)A sexual reproduction____________________.

2. What number and types of chromosomes are found in a human somatic cell?

3. For what purpose(s) might a karyotype be prepared?

4. In alternation of generations, what is the diploid stage of a plant that follows fertilization called?

5. How are sister chromatids and homologous chromosomes different from each other?

6. Mitosis results in the formation of how many cells; meiosis results in the formation of how many cells?

7. Which of the following occurs during meiosis but not during mitosis?

8. What is crossing over?

9. The shuffling of chromosomes that occurs during both fertilization and                    can lead to genetic variation.

10. Heritable variation is required for which of the following?

11. Which of the following might result in a human zygote with 45 chromosomes?

12. In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of these pairs, such as pair 14, which of the following do the two chromosomes of the pair have in common?

13. When we see chiasmata under a microscope, that lets us know which of the following has occurred?

14. For the following question, match the key event of meiosis with the stages listed below.

1. Prophase I
2. Metaphase I
3. Anaphase I
4. Telophase I
5. Synaptonemal complexes form or are still present.

6. Prophase II
7. Metaphase II
8. Anaphase II
9. Telophase II

15. Which of the following is a true statement about sexual vs. asexual reproduction?

16. The following question refers to the essential steps in meiosis described below.

1. Formation of four new nuclei, each with half the chromosomes present in the parental nucleus
2. Alignment of tetrads at the metaphase plate
3. Separation of sister chromatids
4. Separation of the homologs; no uncoupling of the centromere
5. Synapsis; chromosomes moving to the middle of the cell in pairs

XII.         Which of the steps takes place in both mitosis and meiosis?