Lesson Worksheet: Determining Sex in Humans Biology

In this worksheet, we will practice recalling the sex chromosomes in humans and explaining their role in determining the sex of a fetus.

Q1:

Which of the following correctly describes the chromosomes contained within a human female somatic cell?

  • A46 autosomes + XY
  • B23 autosomes + XY
  • C44 autosomes + XX
  • D46 autosomes + XX
  • E44 autosomes + XY

Q2:

Which gamete is responsible for determining the sex of a fetus?

  • AEgg
  • BSperm
  • CNeither

Q3:

A couple are expecting a child. What is the probability, in percent, that this child will be born female?

Q4:

A human somatic (body) cell contains 46 chromosomes. How many chromosomes does a gamete (sex cell) contain?

Q5:

Which of the following statements is correct about the sex chromosomes contained in the sperm and ova?

  • AOva only carry Y chromosomes, whereas sperm can carry either X or Y chromosomes.
  • BSperm only carry Y chromosomes, whereas ova only carry X chromosomes.
  • COva only carry X chromosomes, whereas sperm can carry either X or Y chromosomes.
  • DSperm only carry X chromosomes, whereas ova can carry either X or Y chromosomes.

Q6:

How do the structures of the XandY chromosomes in humans differ?

  • AThe X chromosome contains less than 50% of the genes found on the Y chromosome.
  • BThe X chromosome is much shorter than the Y chromosome.
  • CThe Y chromosome is much shorter than the X chromosome.
  • DThe Y chromosome is much wider than the X chromosome.
  • EThere is no difference in structure between the XandY chromosomes.

Q7:

Which of the following correctly describes the chromosomes contained within a human male somatic cell?

  • A46 autosomes + YY
  • B23 autosomes + XX
  • C44 autosomes + XX
  • D44 autosomes + XY
  • E23 autosomes + XY

Q8:

If an embryo has a Y chromosome, what will start to happen around 7 weeks into pregnancy?

  • ANervous signals will be generated to stimulate the development of female secondary sexual characteristics.
  • BThe embryo will divide rapidly into a large mass of cells.
  • CThe embryo will implant into the uterus wall.
  • DHormones will be released to initiate the formation of the male reproductive organs.

Q9:

What is the meaning of the term autosome?

  • AA chromosome that is found in the gametes of a human
  • BAny chromosome that is not a sex chromosome (X or Y)
  • CA chromosome that has been automatically replicated, ready for cell division
  • DA chromosome that is automatically destroyed when damaged
  • EAny chromosome that has had a section removed

Q10:

Which of the following Punnett squares correctly shows the inheritance of sex chromosomes in humans?

  • A
    Female
    Male XY
    XXXXX
    YXYYY
  • B
    Female
    Male XX
    YXYXY
    YXYXY
  • C
    Female
    Male XX
    XXXXX
    YXYXY
  • D
    Female
    Male XY
    XXXXY
    XXXXY

This lesson includes 15 additional questions for subscribers.

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