Genetic terms (AQA GCSE Biology): Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
How many pairs of chromosomes do humans have in most body cells?
How many pairs of chromosomes do humans have in most body cells?
23 pairs
What does a gene contain instructions for making?
What does a gene contain instructions for making?
A specific protein
How many chromosomes does a human gamete contain?
How many chromosomes does a human gamete contain?
23 single chromosomes
What happens during fertilisation?
What happens during fertilisation?
Gametes join together
What are alleles?
What are alleles?
Different versions of the same gene
What does homozygous mean?
What does homozygous mean?
Having two identical alleles
What does heterozygous mean?
What does heterozygous mean?
Having two different alleles
What is a genotype?
What is a genotype?
The alleles you have
What is a phenotype?
What is a phenotype?
Observable characteristics
How many copies of a dominant allele are needed for it to be expressed?
How many copies of a dominant allele are needed for it to be expressed?
One copy
How many copies of a recessive allele are needed for it to be expressed?
How many copies of a recessive allele are needed for it to be expressed?
Two copies
In mice, B=black fur (dominant), b=brown fur (recessive). What phenotype does Bb show?
In mice, B=black fur (dominant), b=brown fur (recessive). What phenotype does Bb show?
Black fur