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Sex Determination in Humans

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Question

Differentiate between male and female heterogamety.

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Solution

Heterogamety means different sex gametes.
Male heterogamety includes human males having XY sex chromosomes and males of some insects, such as grasshopper and bugs, having XO sex chromosomes.
Female heterogamety includes females of some species of birds, fishes and insects. Females of butterfly and moth consist ZO sex chromosomes, while females of fish, reptiles and birds consist ZW sex chromosomes.

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Difference between male heterogamety and female heterogamety

Q. Five Mark Questions :
(a) Explain the mechanism of sex determination in humans.
(b) Differentiate between male heterogamety and female heterogamety with the help of an example of each

Q. Three Mark Questions :
(i) Why are Grasshopper and Drosophila said to show male heterogamety? Explain.
(ii)Explain Female heterogamety with the help of an example.

Q. Assertion :XX-XY type of sex determination mechanism is an example of female heterogamety and is found in Drosophila. Reason: Male heterogamety is seen in moths where males produce two different types of gamete.

Q. Differentiate between male and female gametes.

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