CAIE A-Level Biology A2 16.2.1 Core Genetic Terms Questions
Define core genetic terms including gene, allele, genotype and phenotype using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Define core genetic terms including gene, allele, genotype and phenotype.
CAIE A-Level Biology A2 16.2.1 Core Genetic Terms Questions question 1
[Maximum number: 2]
Cystic fibrosis is an autosomal recessive genetic disease. People with cystic fibrosis have a homozygous recessive genotype.
Explain the meaning of the terms homozygous and recessive.
homozygous
recessive
1 both alleles of a, gene / genotype, are the same ;
2 phenotype / effect, of (recessive) allele is masked by a dominant allele or two copies of the (recessive) allele are needed for phenotype to be displayed or alleles only affect the phenotype in the absence of a dominant allele or (genotype) must be homozygous for the (recessive) allele to affect the phenotype ;
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