Flashcards
Meiosis
Flashcards do conjunto (14)
- 1What is a gamete?A sex cell
- 2What is a zygote?A fertilised cell
- 3What kind of cells are produced from meiosis?Haploid cells
- 4Special name for meiosis?Reduction division
- 5What are homologous chromosomes?Matching sets of chromosomes with the same genes at the same loci
- 6What is an allele?A different version of the same gene
e.g. eye colour gene, same type of gene, different eye colours - 7What happens at prophase 1?- Chromosomes condense
- Nuclear envelop disintegrates
- Nucleolus disappears
- Spindle formation begins
- Homologous chromosomes pair up forming bilavents - 8What happens at metaphase 1?- Homologous pairs of chromosomes assemble along metaphase plate
- Independent assortment = random lining up of chromosomes - 9What happens at anaphase 1?- Homologous chromosomes pulled to opposite poles and chromatids stay joined
- Sections of DNA on 'sister' chromatids break off and rejoin at chiasmata
- Forms recombiant chromatids
- Genetic variation arises - 10What happens at telophase 1?- Chromosomes assemble at each pole
- Nuclear membrane reforms
- Chromosomes uncoil
- Cytokinesis - 11What happens at prophase 2?- Chromosomes condense
- Nuclear envelope breaks down
- Spindle formation begins - 12What happens at metaphase 2?- Individual chromosomes assemble on metaphase plate
- Crossing over causes independent assortment
- More genetic variation - 13What happens at anaphase 2?- Chromatids pulled to opposite poles after division of centromeres
- 14What happens at telophase 2?- Chromatids assemble at poles
- Chromosomes uncoil
- Nuclear envelope reforms
- Nucleolus becomes visible
- Cytokinesis
Informações
- Descrição
- AS level Biology (Chapter 06 - Cell division) FlashCards sobre Meiosis, criado por Bethany Westwood em 19-01-2017.
- Criado por
- Bethany Westwood
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