Topic 10.1: Meiosis Flashcards Preview

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Flashcards in Topic 10.1: Meiosis Deck (6)
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1

When do chromosomes replicate?

DNA is replicated during the S phase of interphase, resulting in sister chromatids that contain identical DNA strands

2

Divisions of Meiosis

a) Homologous pairs are separated during meiosis I
b) Sister chromatids are separated during meiosis II

3

Independent Assortment

a) During Metaphase I, homologous pairs of chromosomes line up in a random orientation along the equator
b) There is an equal chance of a gamete containing either the maternal or paternal copy of a given chromosome
c) The orientation of each homologous pair is independent to the orientation of any other homologous pair

4

Crossing over

a) During Prophase I, homologous pairs of chromosomes form points of connection between non-sister chromatids
b) The connection points form via a process known as synapsis and the resulting complex is called a bivalent
c) While in synapsis, non-sister chromatids may break and recombine with their homologous partner
d) The non-sister chromatids remain physically connected at points of exchange (chiasmata) until separated by anaphase

5

What may result from crossing over?

In the exchange of alleles

6

Recombinants

The non-sister chromatids that have had genetic material exchanged