AQA Biology- unit 2: 8.3 DNA and chromosomes

what is a chromosome? and what does it do?

a structure made of proteins and DNA, passes on hereditary information

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what is the function of the protein found in chromosomes?

it fixes the DNA strand into position

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how is the whole length of a DNA molecule compacted into a chromosome?

it is highly coiled and folded/looped many times over.

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chromosomes are only visible as distinct structures...

when the cell is dividing

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each gene occupies a specific position along the DNA molecule called a...

locus

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what is an allele?

an alternative/different form of a gene that is found at the same place on a chromosome

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Each chromosome consists of two identical...

chromatids

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Each chromosome contains...

one long DNA molecule

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Other cards in this set

what is the function of the protein found in chromosomes?

it fixes the DNA strand into position

how is the whole length of a DNA molecule compacted into a chromosome?

chromosomes are only visible as distinct structures...

each gene occupies a specific position along the DNA molecule called a...

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