1. How are two homologous chromosomes similar and how are they different? Draw a cell in prophase I of meiosis and describe the events that occur there. Draw a cell in metaphase I and metaphase II of meiosis and differentiate between the two phases. Draw a cell in anaphase I and anaphase II of meiosis and differentiate between the two phases. What stage of the cell cycle occurs before meiosis?

2. Determine the number of chromatids/chromosomes if the diploid number is 50 Number of chromatids in prophase I Number of chromosomes in phrophase I Number of chromosomes in prophase II Number of chromatids in prophase II Number of chromosomes after meiosis Number of chromatids after meiosis Number of chromosomes in G2 Number of chromatids in G2

3. How many sex chromosomes does a human with Down syndrome has in each diploid cell? How many autosomes? Define nondisjunction. Differentiate between aneuploidy and polyploidy. Differentiate between translocation and crossing over State Mendel’s principle of independent assortment. Explain how we correct the principle of independent assortment today

4. If PTC tasting is dominant over non-tasting, what is the expected genotypic and phenotypic ratio of a cross between a non- taster woman and a man with a non-taster mother. Tall pea plants are dominant over short and round pea shape is dominant over wrinkled. What is the expected genotypic and phenotypic ratio if we cross a homozygous tall, heterozygous round pea with a heterozygous tall and wrinkled pea.

5. A man who has blood type B but had a mother who was O blooded marries a woman with O blood. What is the chance of them having a B blooded child? What is the mode of inheritance? When we cross a red flowered organism with a pink flowered organism, what is the expected genotypic and phenotypic ratio of the offspring? What is the mode of inheritance?

6. Hemophilia is a recessive X-linked trait. What is the possible phenotypic and genotypic ratio of the offspring if a man who is normal, marries a woman, who is normal but had a father who is hemophiliac? Color blindness is also a recessive X-linked disorder. If a woman with color blindness marries a normal man, what is their chance of having colorblind sons? Daughters?

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