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

Answer Key

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