1. Diagram the cell cycle. Label the following: G1 phase, G2 phase, S phase, interphase, prophase, metaphase, anaphase, telophase, mitosis, cytokinesis. (5 pts)
see figure 9-2 in your text book
2. A cell has a diploid chromosome number of 2. Diagram that cell in a) mitotic anaphase, b) meiotic anaphase I, and c) meiotic anaphase II. Label the following where they apply: kinetochore, mitotic spindle, centrioles, homologous chromosomes, centromeres, sister chromatids (now considered to be independent chromosomes). Please use the back of this sheet for the diagram. (6 pts)
see figures 9-4 and 9-12 in text book. Note: the text book figures are of a cell with diploid chromosome number of 4.
3. Many animals bear recessive alleles for albinism (a), a condition in which homozygous individuals (aa) completely lack any melanin pigment. If two normally pigmented humans heterozygous (Aa) for the same albinism allele marry, what proportion of their children would be expected to be albino? Draw the appropriate Punnett square diagram. (4 pts)
| A | a | |
| A | AA | Aa |
| a | Aa | aa |
1 albino:3 normal