DNA, Genes & Chromosomes (AQA A-Level Biology): Flashcards
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Prokaryotic DNA structure
Prokaryotic DNA structure
Short, circular, not associated with histones
Eukaryotic DNA structure
Eukaryotic DNA structure
Long, linear, associated with histones
Chromatid definition
Chromatid definition
One of two identical strands of a replicated chromosome, joined at the centromere
Centromere definition
Centromere definition
Point where two chromatids join
DNA length in human cell
DNA length in human cell
Approximately 2 metres
Human chromosome number
Human chromosome number
46
Homologous chromosomes
Homologous chromosomes
Paired chromosomes (one from each parent) carrying the same genes
Diploid number
Diploid number
Total number of chromosomes in homologous pairs
Allele
Allele
Alternative form of a gene
Allele inheritance
Allele inheritance
One allele from each parent for every gene