Family trees (AQA GCSE Biology): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the main purpose of family trees in genetics?
What is the main purpose of family trees in genetics?
To track how traits pass through generations
Which symbol represents males in a family tree?
Which symbol represents males in a family tree?
Squares
What does a filled-in shape indicate on a family tree?
What does a filled-in shape indicate on a family tree?
Person has the condition
How many recessive alleles are needed for cystic fibrosis to show up?
How many recessive alleles are needed for cystic fibrosis to show up?
Two recessive alleles
What does heterozygous mean for parents of a child with cystic fibrosis?
What does heterozygous mean for parents of a child with cystic fibrosis?
One recessive, one dominant allele
How many dominant alleles are needed to taste PTC?
How many dominant alleles are needed to taste PTC?
One dominant allele
Two people with a trait have a child without it. What type of trait is it?
Two people with a trait have a child without it. What type of trait is it?
Dominant
Two heterozygous parents (Ff) have a child. What's the probability the child has ff?
Two heterozygous parents (Ff) have a child. What's the probability the child has ff?
or 25%
Why might real families differ from predicted probability?
Why might real families differ from predicted probability?
Families are usually small
Which letter convention is used for dominant alleles in exams?
Which letter convention is used for dominant alleles in exams?
Capital letters like T
What is true about carriers of recessive conditions?
What is true about carriers of recessive conditions?
Don't show condition but can pass it on
What should you work out first when solving family tree problems?
What should you work out first when solving family tree problems?
Parent genotypes