Download Chapter 8 Test Review (Meiosis) Chromosome Number 1. What

Chapter 8 Test Review (Meiosis)
Chromosome Number
1. What cells have 2 copies of each homologous chromosome for a total of 23 pairs?
2. How many chromosomes are in sperm and ova?
3. What types of cells are haploid?
4. What is diploid?
Meiosis
1. Is meiosis I or meiosis II the separation of homologous chromosomes?
2. Homologous pairs of chromosomes line up in which phase?
3. In what phase do sister chromatids separate?
4. The haploid number of chromosomes line up in which phase?
5. Homologous pairs separate in which phase?
6. What phase has cytokinesis which results in 2 haploid cells?
7. What phase includes the synapsis of homologous pairs into tetrads and crossing over?
8. What phase has cytokinesis which results in 4 haploid cells?
9. Use the pictures to determine whether the cell is at the beginning of meiosis, after meiosis
I, or at the end of meiosis II
Genetic Diversity
1. What are three ways meiosis and sexual reproduction allow for new genetic
combinations?
2. What occurs when each pair of homologous chromosomes segregates (lines up)
independently in metaphase I?
3. How many different combinations would there be in a single gamete if a cell had a
diploid number of 2n = 10?
Crossing Over
1. What is crossing over?
2. Where does crossing over occur?
3. When in meiosis does crossing over occur?
4. Why does crossing over occur?
5. What happens if crossing over doesn’t occur?
Gametogenesis
1. In which gender does gametogenesis occur?
2. In oogenesis there is unequal cytokinesis, what is divided unequally?
3. Why are polar bodies formed?
4. Know all labels on the gametogenesis (Animal Meiosis) handout.
Essay
• Opossums have 22 chromosomes (2n). Explain in a paragraph the probability
(quantitative and qualitative) that any two opossum siblings would be genetically
identical (not monozygotic (identical) twins). Reference and explain independent
assortment, crossing over, and random fertilization.
Chromosome Number
1. What cells have 2 copies of each homologous chromosome for a total of 23 pairs?
somatic
2. How many chromosomes are in sperm and ova? 23
3. What type of cells are haploid? gametes
4. What is diploid? 2n, 2 homologues for each chromosome, chromosomes are in pairs
Meiosis
1. Is meiosis I or meiosis II the separation of homologous chromosomes?
2. Homologous pairs of chromosomes line up in which phase? Meta I
3. In what phase do sister chromatids separate? Ana II
4. The haploid number of chromosomes line up in which phase? Meta II
5. Homologous pairs separate in which phase? Ana I
6. What phase has cytokinesis which results in 2 haploid cells? Telo I
7. What phase includes the synapsis of homologous pairs into tetrads and crossing over?
Pro I
8. What phase has cytokinesis which results in 4 haploid cells? Telo II
9. Use the pictures to determine whether the cell is at the beginning of meiosis, after meiosis
I, or at the end of meiosis II
Genetic Diversity
1. What are three ways meiosis and sexual reproduction allow for new genetic
combinations? Crossing over, Independent assortment, random fertilization
2. What occurs when each pair of homologous chromosomes segregates (lines up)
independently in metaphase I? Independent assortment
3. How many different combinations would there be in a single gamete if a cell had a
diploid number of 2n = 10? 32
Crossing Over
1. What is crossing over? Trading of genetic material, segments of corresponding DNA,
between homologous chromsomes
2. Where does crossing over occur? The primary spermatocyte in the testes and the primary
oocyte in the ovary
3. When in meiosis does crossing over occur? Synapsis of prophase I
4. Why does crossing over occur? To increase genetic diversity (recombination), and to
allow the cells to avoid nondisjunction (makes chromosomes sticky so both can move to
metaphase plate in metaphase I
5. What happens if crossing over doesn’t occur? nondisjunction
Gametogenesis
1. In which gender does gametogenesis occur? Both males and females
2. In oogenesis there is unequal cytokinesis, what is divided unequally? cytoplasm
3. Why are polar bodies formed? To conserve cytoplasm for developing ovum (source of
food)
4. Know all labels on the gametogenesis (Animal Meiosis) handout.
Essay
•
Opossums have 22 chromosomes (2n). Explain in a paragraph the probability
(quantitative and qualitative) that any two opossum siblings would be genetically
identical (not monozygotic (identical) twins). Reference and explain independent
assortment, crossing over, and random fertilization.
• Think about it and crunch the numbers