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Meiosis And Sexual Reproduction.edited

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Biology
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Ardmore high school
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Meiosis and sexual reproduction
I Chromosome numbers
A. What are homologous chromosomes?
1. The chromosomes that make up a pair, one from each parent.
2. Homologous chromosomes are similar but not identical.
B. How is chromosome number maintained in a species?
1. Gametes are haploid sex cells with half the number of chromosomes.
2. Haploid cell is a cell with n number of chromosomes.
3. Diploid cell is a cell with 2n chromosomes.
C. How is sex determined?
1. Sex chromosomes determine an individual’s gender.
2. Individuals with an X and Y chromosome are male.
3. Individuals with two X chromosomes are female.
II Meiosis I
A. What happens during interphase?
1. A cell in interphase carries out a variety of metabolic functions, copies its
DNA, and makes proteins.
B. What happens during prophase I?
1. Replicated chromosomes condense, and chromosomes become visible under a
light microscope.
2. Homologous chromosomes begin to form homologous pairs in a process
called synapsis.
3. Prophase 1 continues as the chromosomes move to opposite sides of the cell.

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Meiosis and sexual reproduction I Chromosome numbers A. What are homologous chromosomes? 1. The chromosomes that make up a pair, one from each parent. 2. Homologous chromosomes are similar but not identical. B. How is chromosome number maintained in a species? 1. Gametes are haploid sex cells with ...
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