1. What is the correct definition of meiotic cell division?
  • A.   One haploid nucleus divides by meiosis to produce four diploid nuclei
  • B.   One diploid nucleus divides by meiosis to produce four haploid nuclei
  • C.   One diploid nucleus divides by meiosis to produce four diploid nuclei
  • D.   One haploid nucleus divides by meiosis to produce four haploid nuclei
2. In meiosis the nucleus undergoes two divisions. Which of the statements about meiosis I is correct?
  • A.   The number of chromatids is doubled, and the number of chromosomes halved.
  • B.   The number of chromosomes is halved, and the number of nuclei is doubled.
  • C.   The number of chromatids is doubled, and the number of chromosomes halved.
  • D.   The number of nuclei is halved, and chromosomes is doubled.
3. In which phase of meiosis do homologous pairs of chromosomes line up along the equator of the cell?
  • A.   Anaphase II
  • B.   Anaphase I
  • C.   Metaphase II
  • D.   Metaphase I
4. What information can be obtained from this karyotype?

Karyotype_image

I. The individual is male
II. The individual has Down’s Syndrome
III. The individual is 22 years old

Wikimedia
public domain
  • A.   I, II and III
  • B.   I only
  • C.   I and II only
  • D.   II and III only
5. What is the correct definition of random assortment?
  • A.   The orientation of pairs of homologous chromosomes at Metaphase I.
  • B.   The orientation of pairs of homologous chromosomes at Metaphase II.
  • C.   The orientation of sister chromatids at Prophase I.
  • D.   The orientation of sister chromatids at Prophase II.
6. Chorionic villus sampling (CVS) allows cells to be removed from the fetus to provide a karyotype. Which of the below describes CVS?
  • A.   Sampling fetal cells from the digestive system.
  • B.   Sampling fetal cells from the amniotic fluid.
  • C.   Sampling fetal cells from the placenta.
  • D.   Sampling fetal cells from the umbilical cord.
7. What happens in crossing over and when does it occur?
  • A.   Exchange of genetic material between homologous chromosomes in Prophase I.
  • B.   Exchange of genetic material between sister chromatids in Prophase I.
  • C.   Exchange of genetic material between homologous chromosomes in Prophase II.
  • D.   Exchange of genetic material between sister chromatids in Prophase II.

8. Which of the following promotes genetic variation in sexual reproduction?

I. Crossing over
II. Random orientation
III. Fusion of gametes from different parents
 
  • A.   I only
  • B.   I and II only
  • C.   II and III only
  • D.   I, II and III
9. Non-disjunction refers to the chromosomes failing to separate correctly, resulting in gametes with one extra or one missing chromosome. When can this occur?
  • A.   Prophase I
  • B.   Anaphase I and II
  • C.   Anaphase I only
  • D.   Anapahse II only

10. Which of the descriptions below best describes a diploid organism with 12 chromosomes in each body (somatic) cell?

  Number of chromosomes per cell at the beginning of Meiosis II Number of chromosomes per cell at the end of Meiosis II
A. 6 12
B. 6 6
C. 12 12
D. 12 6