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Question
What is heterogamety? Explain the mechanism of sex determination in Drosophila. [3 Marks]
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Solution
The phenomena where a sexually reproducing organism produces two morphologically distinct gametes is called heterogamety. [1 Mark]
In Drosophila , males produce two types of gametes. One with X chromosome and one with Y chromosome. Females produce only one type of chromosome, all with X chromosomes. [1 mark]
When a sperm containing X chromosome fertilises an egg containing X chromosome, female drosophila with XX constitution are produced. [0.5 mark]
When a sperm containing Y chromosome fertlises an egg containing X chromosome, male drosophila with XY constitution are formed. [0.5 Mark]
In Drosophila , males produce two types of gametes. One with X chromosome and one with Y chromosome. Females produce only one type of chromosome, all with X chromosomes. [1 mark]
When a sperm containing X chromosome fertilises an egg containing X chromosome, female drosophila with XX constitution are produced. [0.5 mark]
When a sperm containing Y chromosome fertlises an egg containing X chromosome, male drosophila with XY constitution are formed. [0.5 Mark]
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