Meiosis and variation

1. What is the correct definition of homologous chromosomes
   1. paired chromosomes that have the same genes at the same loci, but possibly different alleles.
   2. paired chromosomes that both come from the mother
   3. paired chromosomes with different genes on them
   4. paired chromosomes that are identical to each other
2. Crossing over accomplishes what?
   1. DNA replication
   2. Identical sister chromatids
   3. Fertilization
   4. Genetic recombination
3. The structure with 4 chromatids is known as
   1. Chromatid
   2. Chromosome
   3. Homologous chromosomes
   4. Tetrad
4. 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
6. Which phase is it when homologous chromosomes line up in the middle of the cell?
   1. Metaphase I
   2. Anaphase II
   3. Metaphase II
   4. Anaphase I
7. If an organism's diploid number is 24, then it's haploid number is what?
   1. 48
   2. 36
   3. 12
   4. 24
8. The number of chromosomes in a human muscle cell is 46, so how many are in a human egg cell?
   1. 23
   2. 46
   3. 92
   4. 24
9. Gametes would have which of the following:
   1. Homologous chromosomes
   2. Half of the number of chromosomes found in body cells
   3. Twice the number of chromosomes found in body cells
   4. The same number of chromosomes found in body cells

Answer Key

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