Flashcards
AQA AS Biology Unit 2 DNA and Meiosis
Cards in this deck (14)
- 1NucleotideSection of DNA made up of:
1 pentose sugar
1 Phosphate group
1 Base (Nucleic Acid) - 2ComplementaryAdenine always bonds with Thymine
Cytosine always bonds with Guanine
They are complementary - 3PurinesConsist of a six-membered and a five-membered nitrogen-containing ring, fused together
(Adenine and Guanine) - 4PyrimidineHave only a six-membered nitrogen-containing ring
(Thymine, Cytosine and Uracil) - 5GeneA section of DNA that codes for making a polypeptide
- 6Triplet Code3 bases code for an amino acid
- 7ChromosomeThread-like structure made of protein and DNA, passes hereditary information on
- 8Homologous Chromosome2 chromosomes determining the same characteristics
(one maternal, one paternal) - 9AlleleOne of the different forms of a gene
- 10MeiosisCell division that produces 4 haploid cells
(half the chromosomes) they are all genetically different and are called 'daughter cells' - 11Mitosiscell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus
- 12LocusPosition of a gene on a chromosome
- 13Independent segregationHomologous pairs randomly separate during meiosis 1 into separate cells
- 14Crossing overThe process where chromatids break and rejoin with their homologous chromosomes to exchange pairs
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- A Levels Biology unit 2 Flashcards on AQA AS Biology Unit 2 DNA and Meiosis, created by elliedee on 25/03/2015.
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