Flashcards in 3.3 and 10.1 Meiosis Deck (7)
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1
In what way is meiosis a reduction division?
Meiosis involved a halving of the chromosome number from 2n to n and is thus a reduction.
2
Why is meiosis important to sexually reproducing organisms?
-Halving of chromosome number allows a sexual life cycle with fusion of gametes
-allows for genetic diversity
-fertilization doubles the number of chromosomes each time it occurs so meiosis prevents each generation having double the amount of chromosomes.
3
Are the sister chromatids of one chromosome identical to each other?
Initially, yes, but DNA replication mistakes change that.
4
Are the two homologous chromosomes identical to each other?
No, they are homologous but not identical and so map the same genes but can have different alleles.
5
Define bivalents.
In early stages of meiosis, homologous pairs form bivalents. This consists of four sister chromatids and two homologous chromosomes. Bivalents are also called tetrads.
6
What is the process of forming bivalents called? What occurs then?
It is called synapsis. During this time, crossing over occurs.
7
