Genetic terms (AQA GCSE Biology): Flashcards
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Practise the cards
15 cards from this deck
What the nucleus contains
What the nucleus contains
Thread-like structures called chromosomes
Number of chromosome pairs in humans
Number of chromosome pairs in humans
23 pairs
Definition of a gene
Definition of a gene
Small piece of DNA that codes for a specific protein
What chromosomes are
What chromosomes are
Long structures made of DNA carrying many genes
What gametes are
What gametes are
Special sex cells made through meiosis
Examples of gametes in animals
Examples of gametes in animals
Sperm and egg cells
What fertilisation is
What fertilisation is
When gametes join together
Number of chromosomes in gametes
Number of chromosomes in gametes
23 single chromosomes (not pairs)
Definition of alleles
Definition of alleles
Different versions of the same gene
What homozygous means
What homozygous means
Having two of the same alleles
What heterozygous means
What heterozygous means
Having two different alleles
Definition of genotype
Definition of genotype
The actual alleles you have for a gene
Definition of phenotype
Definition of phenotype
Observable characteristics
Dominant allele expression rule
Dominant allele expression rule
Expressed even with only one copy
Recessive allele expression rule
Recessive allele expression rule
Only expressed when you have two copies