Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
draw the diagram of Deletion loops form in the chromosomes of
deletion heterozygotes.
A 'homologous pair' of chromosomes are approximately the same length and centromere position. They have the same sequence of genes but may have allele variations for those Genes.
During prophase, these homologous chromosomes are arranged across the 'equator' of the cell. This arrangement enables an allele-shuffling mechanism called 'crossing over' in which two homologous chromosomes exchange genetic material.
Crossing over, thus results in recombination by the exchange of DNA between the two chromatids. Recombination is the primary cause of genetic variation.
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