Flashcards
Sexual Reproduction and Meiosis
Flashcards do conjunto (15)
- 1What are alleles?Different versions of a certain gene
- 2What are homologous chromosomes ?Pairs of matching chromosomes (chromosomes are the same size and have the same genes)
- 3Complete the sentence: Normal body cells have the _________ number (____) of chromosomesNormal body cells have the DIPLOID number (2n) of chromosomes
- 4Complete the sentence: Gametes have a ___________ number of chromosomes (__)Gametes have a HAPLOID number of chromosomes (n)
- 5What is the name for the diploid cell produced by fertilisation?Zygote
- 6What are the 8 steps of meiosis?Prophase 1
Metaphase 1
Anaphase 1
Telophase 1
Prophase 2
Metaphase 2
Anaphase 2
Telophase 2 - 7What happens during prophase 1?Chromosomes condense
Homologous chromosomes pair up
Crossing-over occurs
Centrioles move to poles
Nuclear envelope breaks down - 8What happens during metaphase 1?Homologous pairs line up at the equator
Spindle fibres attach to the centromeres
- 9What happens during anaphase 1?Spindles contract, pulling the pairs apart
- 10What happens during telophase 1?Nuclear envelope forms
Cytokinesis occurs
2 haploid daughter cells produced
- 11What happens during prophase 2?Centrioles move to poles (right-angle to the previous division)
Nuclear envelopes break down
- 12What happens during metaphase 2?Chromosomes line up at equator
Spindles attach to centromeres
- 13What happens during anaphase 2?Spindles contract, pulling each sister chromatid to the poles
- 14What happens during telophase 2?Nuclear envelope forms
Cytokinesis occurs
4 haploid daughter cells produced
- 15How does genetic variation occur during meiosis?Mutations
Crossing-over of chromatids (same genes, different combinations of alleles), forming a chiasma
Independent assortment of chromosomes
Informações
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- O usuário eliminou as informações de disciplina FlashCards sobre Sexual Reproduction and Meiosis, criado por Usuário eliminado em 05-03-2018.
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- Usuário eliminado · mar 2018
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- 5 mar 2018
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- Criado por Yinka F · 30 jan 2018
- Copiado por Yinka F · 5 mar 2018
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