Meiosis and variation

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

Answer Key

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