DNA and Chromosomes

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  • Created by: Alice
  • Created on: 28-05-14 12:25
Why do homologous pairs form?
Always an even number of chromosomes. One of each pair from maternal chromosomes, one from paternal chromosomes. Total number is diploid number.
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What is an allele?
Genes code for information with specific base sequences - come in several forms called alleles
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Different alleles...
...code for different polypeptides
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If there is a difference in base sequence of an allele of a gene, what results?
A difference in amino acid sequence, producing different proteins/polypeptides
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What happens during packaging by histones?
DNA molecule combined with proteins. Forms coiled DNA-protein complex. Coils fold to produce loops, loops coil and pack together to form chromosomes.
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If a eukaryotic cell has a true nucleus with protein packaging histones to form chromosomes, with large linear DNA, what does a prokaryotic cell have?
Smaller DNA which is circular, with no true nucleus or proteins.
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Other cards in this set

Card 2

Front

What is an allele?

Back

Genes code for information with specific base sequences - come in several forms called alleles

Card 3

Front

Different alleles...

Back

Preview of the front of card 3

Card 4

Front

If there is a difference in base sequence of an allele of a gene, what results?

Back

Preview of the front of card 4

Card 5

Front

What happens during packaging by histones?

Back

Preview of the front of card 5
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