Family trees (AQA GCSE Biology Combined Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
In a family tree, what do squares represent?
In a family tree, what do squares represent?
Males
What do filled or shaded shapes show in a family tree?
What do filled or shaded shapes show in a family tree?
People who have the condition
How many copies of a recessive allele are needed to have the condition?
How many copies of a recessive allele are needed to have the condition?
Two copies
What happens if you have only one copy of a recessive allele like cystic fibrosis?
What happens if you have only one copy of a recessive allele like cystic fibrosis?
You're a carrier with no symptoms
Can recessive conditions 'skip' generations?
Can recessive conditions 'skip' generations?
Yes, they can skip generations
How often do dominant conditions appear in family trees?
How often do dominant conditions appear in family trees?
In every generation
How many parents need to have a dominant allele for a child to be affected?
How many parents need to have a dominant allele for a child to be affected?
Only one parent
What tool shows all possible allele combinations from two parents?
What tool shows all possible allele combinations from two parents?
Punnett square
If both parents are CF carriers (Ff × Ff), what chance does their child have of having CF?
If both parents are CF carriers (Ff × Ff), what chance does their child have of having CF?
or 25%
PTC tasting ability is controlled by which type of allele?
PTC tasting ability is controlled by which type of allele?
A dominant allele