Haploid and Diploid Cells (Leaving Cert Biology): Flashcards

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Haploid and Diploid Cells
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What are chromatids?

Identical DNA copies formed when DNA replicates

Centromere

Region where chromatids join

Haploid cells - chromosome sets

Single set (one of each chromosome)

Haploid symbol

nn

Haploid cells in humans - examples

Gametes (eggs and sperm)

Human haploid number

n=23n = 23

Diploid cells - chromosome sets

Two complete sets

Diploid symbol

2n2n

Diploid cells in humans - examples

Somatic cells (muscle, nerve, skin)

Human diploid number

2n=462n = 46

Homologous pairs

Paired similar chromosomes: one maternal, one paternal

Cell division maintaining chromosome number

Mitosis

Cell division reducing chromosome number by half

Meiosis

Fusion of haploid gametes - effect

Restores diploid number

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