Card Set Information
What creates variation?
Crossing over in Prophase I
Independent assortment in Metaphase I
which egg? Cell makes 1 egg and 2 polar bodies
Which sperm? Fertilization is a random event
primary spermatocyte makes 4 sperm
ova, or eggs
during fetal development, stops at prophase I
with each cycle starting with puberty
I completes prior to ovulation
ovulation and fertilization, meiosis II completes
1 egg and 2 polar bodies…variation
2 cell divisions in Meiosis
What happens during Meiosis I?
Homologous pairs separate
What happens during Meiosis II?
Sister chromatids separate, producing 4 daughter cells, each haploid (1n)
Having one of each type of chromosome characteristic of the species.
Stages of Meiosis I
Process in which homologous chromosomes exchange corresponding segments during prophase I of meiosis.
chromosomes pair up, called synapsis
pairs line up along the cell’s equator (middle)
•Independent assortment occurs
pairs separate (apart)
towards opposite ends of the cell
Period between Meiosis I and Meiosis II
Same thing happens as in Meiosis I: Prophase II, Metaphase II, Anaphase II, Telophase II--DNA isn't replicated so the end result is haploid cells
What does mitosis NOT have?
NO homologous pairs
NO crossing over
NO independent assortment
What does mitosis have?
2 diploid daughters
What does meiosis have?
Homologs and sister chromatids separate
4 haploid daughters