Genetic Inheritance (AQA GCSE Biology Combined Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
How many chromosomes do human gametes contain?
How many chromosomes do human gametes contain?
23 chromosomes
What are chromosomes made of?
What are chromosomes made of?
DNA coiled around histones
What is a gene?
What is a gene?
A DNA segment coding for a protein
How many alleles does a human have for each gene?
How many alleles does a human have for each gene?
Two alleles (one from each parent)
When is a dominant allele expressed in the phenotype?
When is a dominant allele expressed in the phenotype?
When only one copy is present
When is a recessive allele expressed?
When is a recessive allele expressed?
When two copies are present
What does homozygous mean?
What does homozygous mean?
Both alleles for a gene are the same
What is a phenotype?
What is a phenotype?
Observable physical traits
In a Punnett square, how are dominant traits represented?
In a Punnett square, how are dominant traits represented?
Uppercase letters
In a Bb x Bb cross, what % of offspring show the dominant trait?
In a Bb x Bb cross, what % of offspring show the dominant trait?
75%