Ch. 13 meiosis
Review terms:
Meiosis
Sex chromosomes
Genes
Diploid
Paternal chromosome
Meiosis II
Early prophase I
Anaphase I
Tetrad
Synaptonemal complex
Anaphase II
Gametes
Autosomes
Alleles
Ploidy
Maternal chromosome
Reduction division
Late prophase I
Telophase I
Crossing over
Prophase II
Telophase II
Karyotype
Homologs
Haploid
Polyploidy
Meiosis I
Gametogenesis
Metaphase I
Synapsis
Chiasmata
Metaphase II
Worksheet:
1. During Meiosis I genetic variation occurs by independent assortment and crossing
over.
a. What phase do these occur in?
b. Describe the process of independent assortment
c. Describe the process of crossing over
2. Mistakes in meiosis occur accidentally
a. What is nondisjunction and what does it result in
b. Give an example of nondisjunction
3. Briefly describe the following hypothesis for meiosis
a. Purifying selection hypothesis
b. Changing-environment hypothesis