Cell Division, Diversity, and Organisation (OCR A-Level Biology A): Flashcards
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Practise the cards
10 cards from this deck
Homologous pair
Homologous pair
Two chromosomes carrying same sequence of genes
Number of homologous pairs in humans
Number of homologous pairs in humans
23 pairs
Haploid number (n)
Haploid number (n)
One set of chromosomes
Alleles
Alleles
Different versions of the same gene
Number of cells produced by meiosis
Number of cells produced by meiosis
Four haploid cells
What separates during Anaphase I
What separates during Anaphase I
Homologous chromosomes (sister chromatids stay together)
Bivalent/tetrad
Bivalent/tetrad
Paired homologous chromosomes (4 chromatids total)
Crossing over
Crossing over
DNA exchange between non-sister chromatids in Prophase I
Independent assortment formula for combinations
Independent assortment formula for combinations
2^n where n = number of chromosome pairs
Three sources of variation in meiosis
Three sources of variation in meiosis
Independent assortment, crossing over, random fertilisation