Meiosis and variation

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

Answer Key

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