DNA and Meiosis

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  • Created by: elyornais
  • Created on: 28-01-15 20:02
What is a nucleotide made up of?
A phosphate group, a base and deoxyribose.
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What reaction joins nucleotides together?
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What makes a DNA molecule stable?
The hydrogen bonds between specific base pairs and the sugar phosphate backbone.
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What is a locus?
The position of a gene on a chromosome.
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What is an allele?
A different version of a gene.
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What do genes code for?
Polypeptides that determine the nature and development of organisms.
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What is a triplet and what does it code for?
A sequence of three bases that codes for an amino acid.
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What may differences in base sequence of alleles of a single gene result in?
Non-functional proteins.
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Give two differences between DNA in prokaryotes and eukaryotes.
DNA is linear and associated with proteins(histones) in eukaryotes but in prokaryotes, it is smaller, circular and not associated with proteins.
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What does meiosis produce?
4 gametes that each contain half of the genetic information from the original cell in sexual reproduction.
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What does diploid mean?
Two of each chromosome.
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What does haploid mean?
Only one of each chromosome.
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What is a homologous pair?
Chromosomes containing the same genes.
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How does meiosis cause genetic variety?
Random fusion of gametes, independent segregation and genetic recombination by chromatids crossing over.
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What is meant by independent segregation of homologous chromosomes?
The 23 pairs of chromosomes line up side by side. This line is arranged randomly. One of each pair will pass to each daughter ceell, this process is completely random.
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What reaction joins nucleotides together?



Card 3


What makes a DNA molecule stable?


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Card 4


What is a locus?


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Card 5


What is an allele?


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