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AQA GCSE Biology > 4.6.1.8 Sex Determination > Flashcards

4.6.1.8 Sex Determination Flashcards

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1
Q

Sex chromosomes:

A
  • a pair of chromosomes responsible for the determination of gender
  • XY in males
  • XX in females
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2
Q

How many chromosomes do ordinary human body cells contain?

A
  • ordinary human body cells contain 23 pairs of chromosomes
  • 46 chromosomes, 46 chromatids
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3
Q

How many pairs of chromosomes control characteristics and how many determine sex?

A
  • 22 pairs of chromosomes control characteristics only
  • one pair of chromosomes carry the genes that determine sex
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4
Q

Sex chromosomes for females:

A

in females sex chromosomes are the same - XX

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5
Q

Sex chromosomes for males:

A

in the males the sex chromosomes are different - XY

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6
Q

What is the probability of a child being male or female?

A
  • Punnett squares can be used to show sex inheritance
  • there is a 50% chance of the child being male and a 50% chance of the child being a female
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AQA GCSE Biology (109 decks)

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