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Combined Science: Biology

GCSE · Edexcel · higher

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  6
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  8
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  6
Cycles within Ecosystems

Predicting Genetic Inheritance Flashcards

All 4 cards in this deck

What phenotype ratio is expected from a cross between two heterozygous parents (Hh × Hh)?: 3 dominant : 1 recessive (genotypes 1 HH : 2 Hh : 1 hh).
In a family pedigree, two unaffected parents have an affected child. What does this show about the allele and the parents' genotypes?: The allele is recessive, and both parents are heterozygous (carriers, Hh).
True or false? In a pedigree, an unaffected child of a parent with a recessive disorder must have inherited the dominant allele.: True. Unaffected offspring must have inherited the dominant allele from one parent.
What is a carrier of a genetic disorder?: A person with one copy of the recessive allele for the disorder (heterozygous, e.g. Ff). They do not have the disorder but can pass the allele on.