Meiosis and variation

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

Answer Key

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