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Lesson 5 Male Or Female (Foundation)

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This document describes an experiment using beads to simulate fertilization and determine the sex of offspring. 200 black beads represent sperm with spots, and 200 clear beads represent unspotted eggs. Students predicted and then recorded the results of 50 simulated fertilizations. The results showed that whether an offspring is male or female is determined completely by chance, with a 1 in 2 probability each time.

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Male of female??? Aims: To find out how the sex of an offspring is determined. Using Beads to show fertilisation happens by chance.
Introduction: The beads will represent sex cells. One colour will be sperms and the other colour will be ovum.
Method: Mark 20 (black felt spot) out of the 200 male sperm cells and put them into a beaker. Mark 20 (black felt spot) out of the 200 female egg cells and put them into another beaker. Fill in the prediction box below.
Prediction. Female cell with a spot Female cell with no spot Male cell with a spot Male cell with no spot Number of times it will be picked Type of bead that can be picked
Method: You are going to make 50 combinations of a fertilised egg, all the results will be recorded in a tally box, like the one below. Each pair picked out must be put aside in another container. Carry on until 50 fertilisations have been done.
Results: 50 Total number of fertilisations Female cell with a spot Female cell with no spot Male cell with a spot Male cell with no spot Total of tallies Number of recorded in each fertilisation Type of bead that can be picked
Conclusion: How many times did you pick a male cell with a spot? How many times did you pick a female cell with a spot? How do the actual results match up with your predictions? Write a few sentences in summary has to what the experiment has shown you.
Questions. What does this tell us about the probability of a couple having a boy or a girl? If a couple already have 2 children, what is the likely chance of them having a boy? What do you think the ratio of male to females are in the world? Are there any other factors that could change your answer to Q 3.

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Lesson 5 Male Or Female (Foundation)

  • 1. Male of female??? Aims: To find out how the sex of an offspring is determined. Using Beads to show fertilisation happens by chance.
  • 2. Introduction: The beads will represent sex cells. One colour will be sperms and the other colour will be ovum.
  • 3. Method: Mark 20 (black felt spot) out of the 200 male sperm cells and put them into a beaker. Mark 20 (black felt spot) out of the 200 female egg cells and put them into another beaker. Fill in the prediction box below.
  • 4. Prediction. Female cell with a spot Female cell with no spot Male cell with a spot Male cell with no spot Number of times it will be picked Type of bead that can be picked
  • 5. Method: You are going to make 50 combinations of a fertilised egg, all the results will be recorded in a tally box, like the one below. Each pair picked out must be put aside in another container. Carry on until 50 fertilisations have been done.
  • 6. Results: 50 Total number of fertilisations Female cell with a spot Female cell with no spot Male cell with a spot Male cell with no spot Total of tallies Number of recorded in each fertilisation Type of bead that can be picked
  • 7. Conclusion: How many times did you pick a male cell with a spot? How many times did you pick a female cell with a spot? How do the actual results match up with your predictions? Write a few sentences in summary has to what the experiment has shown you.
  • 8. Questions. What does this tell us about the probability of a couple having a boy or a girl? If a couple already have 2 children, what is the likely chance of them having a boy? What do you think the ratio of male to females are in the world? Are there any other factors that could change your answer to Q 3.