Genetic Inheritance (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
📚Flashcards
Practise the cards
15 cards from this deck
ShowHide
Practise the cards
15 cards from this deck
How many chromosomes in human gametes?
How many chromosomes in human gametes?
23
What type of cell are gametes?
What type of cell are gametes?
Haploid cells
What is chromosome composition?
What is chromosome composition?
DNA coiled around histone proteins
What does a gene code for?
What does a gene code for?
Specific protein instructions
What is an allele?
What is an allele?
Different versions of a gene
How many alleles per gene in humans?
How many alleles per gene in humans?
Two (one from each parent)
When is a dominant allele expressed?
When is a dominant allele expressed?
When at least one copy present
When is a recessive allele expressed?
When is a recessive allele expressed?
Only when two copies present
What is a homozygous genotype?
What is a homozygous genotype?
Both alleles same (AA or aa)
What is a heterozygous genotype?
What is a heterozygous genotype?
Two alleles different (Aa)
What is genotype?
What is genotype?
Genetic makeup of alleles (e.g., AA, Aa, aa)
What is phenotype?
What is phenotype?
Observable physical/physiological traits
What is the purpose of a Punnett square?
What is the purpose of a Punnett square?
Predict offspring allele combination probabilities
How are dominant alleles written?
How are dominant alleles written?
Uppercase letters (e.g., A)
How are recessive alleles written?
How are recessive alleles written?
Lowercase letters (e.g., a)