Meiosis and variation

1. Which phase is it when homologous chromosomes line up in the middle of the cell?
   1. Anaphase I
   2. Metaphase I
   3. Anaphase II
   4. Metaphase II
2. Which of the following is NOT true about the chromosomes in your body?
   1. Exists in 46 pairs
   2. Exists in 23 pairs
   3. Includes 2 sex chromosomes
   4. Includes 46 total chromosomes
3. The number of chromosomes in a human muscle cell is 46, so how many are in a human egg cell?
   1. 46
   2. 92
   3. 23
   4. 24
4. The structure with 4 chromatids is known as
   1. Homologous chromosomes
   2. Chromatid
   3. Chromosome
   4. Tetrad
5. If an organism's diploid number is 24, then it's haploid number is what?
   1. 24
   2. 48
   3. 36
   4. 12
6. 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.
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. Homologous chromosomes
   2. The same number of chromosomes found in body cells
   3. Twice the number of chromosomes found in body cells
   4. Half of the number of chromosomes found in body cells

Answer Key

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