Alleles (Edexcel GCSE Biology Combined Science): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What are alleles?
What are alleles?
Different versions of the same gene
How many alleles does each individual have for every gene?
How many alleles does each individual have for every gene?
Two alleles
What term describes an individual with two identical alleles for a gene?
What term describes an individual with two identical alleles for a gene?
Homozygous
What term describes an individual with two different alleles for a gene?
What term describes an individual with two different alleles for a gene?
Heterozygous
What is a genotype?
What is a genotype?
The combination of alleles an individual has
What is a phenotype?
What is a phenotype?
The physical expression of a trait
How are dominant alleles represented in genetic diagrams?
How are dominant alleles represented in genetic diagrams?
By a capital letter
How are recessive alleles represented in genetic diagrams?
How are recessive alleles represented in genetic diagrams?
By a lowercase letter
What genotype is needed for a recessive characteristic to be expressed?
What genotype is needed for a recessive characteristic to be expressed?
Two recessive alleles (e.g., cc)
How are most traits determined?
How are most traits determined?
By interaction of multiple genes