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A bivalent consists of
Option: 1
Two chromatids and one centromere
Option: 2
Two chromatids and two centromeres
Option: 3
Four chromatids and two centromeres
Option: 4
Four chromatids and four centromeres
Answers (1)
Stages of Meiosis ? - Metaphase I and Anaphase I -
Anaphase I
- The homologous chromosomes of each bivalent separate from each other.
- The separated homologous chromosomes move to opposite poles
- Therefore, in this phase, the chromosomes separate and not the chromatids.
- So, each chromosome will still have two sister chromatids.
- Hence, anaphase I involve a reduction in the number of chromosomes.
-
A bivalent is made up of two paired homologous chromosomes. Each homologous chromosome has two chromatids and one centromere, therefore, a bivalent will have four chromatids and two centromeres.
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