What is Crossing Over?. A Chromosome from your MOM. A Chromosome from your DAD. The Chromosomes that end up EGG or SPERM cells. Homologous Chromosomes Crossing Over. Ref: http://gnn.tigr.org/whats_a_genome/Chp3_2.shtml. It is the exchange or transfer of genes between HOMOLOGOUS CHROMOSOMES.
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A Chromosome from your DAD
The Chromosomes that end up EGG or SPERM cells.
Homologous Chromosomes Crossing Over
It is the exchange or transfer of genes between HOMOLOGOUS CHROMOSOMES
Meiosis creates reproductive cells needed
for sexual reproduction which can
increase genetic diversity in a species.
Mitosis creates genetically identical cells
by asexual binary fission.
During Prophase I of Meiosis
Remember the differences between Mitosis and Meiosis?
homologous chromosomes crossing over
46 chromosomes: DIPLOID (23 pairs)
Chromosomes get copied during Interphase
46 chromosomes AND their copies: still DIPLOID
After MEIOSIS I there are 23 chromosomes PLUS THEIR MODIFIED COPIES in each: now HAPLOID
After MEIOSIS II there are 23 SINGLE chromosomes in each of these 4 cells: still HAPLOID
Human Meiosis and Crossing Over