Meiosis and variation

1. Which phase is it when homologous chromosomes line up in the middle of the cell?
   1. Metaphase I
   2. Metaphase II
   3. Anaphase II
   4. Anaphase I
2. If an organism's diploid number is 24, then it's haploid number is what?
   1. 36
   2. 24
   3. 48
   4. 12
3. What is the correct definition of homologous chromosomes
   1. paired chromosomes that are identical to each other
   2. paired chromosomes that both come from the mother
   3. paired chromosomes with different genes on them
   4. paired chromosomes that have the same genes at the same loci, but possibly different alleles.
4. Which of the following is NOT true about the chromosomes in your body?
   1. Includes 2 sex chromosomes
   2. Includes 46 total chromosomes
   3. Exists in 23 pairs
   4. Exists in 46 pairs
5. The structure with 4 chromatids is known as
   1. Homologous chromosomes
   2. Chromosome
   3. Tetrad
   4. Chromatid
7. The number of chromosomes in a human muscle cell is 46, so how many are in a human egg cell?
   1. 24
   2. 92
   3. 23
   4. 46
8. Crossing over accomplishes what?
   1. Fertilization
   2. DNA replication
   3. Identical sister chromatids
   4. Genetic recombination
9. Gametes would have which of the following:
   1. Twice the number of chromosomes found in body cells
   2. The same number of chromosomes found in body cells
   3. Homologous chromosomes
   4. Half of the number of chromosomes found in body cells

Answer Key

1. A) Metaphase I
2. D) 12
3. D) paired chromosomes that have the same genes at the same loci, but possibly different alleles.
4. D) Exists in 46 pairs
5. C) Tetrad
6. C)
7. C) 23
8. D) Genetic recombination
9. D) Half of the number of chromosomes found in body cells