Inheritance of sex & sex linkage (Edexcel GCSE Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
How many pairs of chromosomes do human body cells have?
How many pairs of chromosomes do human body cells have?
23 pairs
Which pair of chromosomes carries the sex determining genes?
Which pair of chromosomes carries the sex determining genes?
The 23rd pair
What sex chromosomes do males have?
What sex chromosomes do males have?
XY
What sex chromosomes do females have?
What sex chromosomes do females have?
XX
What is the probability of a child being male?
What is the probability of a child being male?
50%
What sex chromosomes do the father's gametes contain?
What sex chromosomes do the father's gametes contain?
Half contain Y, half contain X
Why are sex-linked disorders most common in men?
Why are sex-linked disorders most common in men?
They only have one X chromosome
What function does the second X chromosome have in females for sex-linked disorders?
What function does the second X chromosome have in females for sex-linked disorders?
A 'protective' function
How many copies of the recessive allele do women need to be colour blind?
How many copies of the recessive allele do women need to be colour blind?
Two copies
How many copies of the recessive allele do men need to be colour blind?
How many copies of the recessive allele do men need to be colour blind?
One copy
What is a carrier of colour blindness?
What is a carrier of colour blindness?
A woman with one copy who is not colour blind
What is haemophilia?
What is haemophilia?
Disease where blood doesn't clot