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Question
Differentiate between male and female heterogamety.
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Solution
Male heterogamety: 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: 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.
RELATED QUESTIONS
A new born child has an XY pair of chromosmes. Will it be a baby boy or a baby girl?
Which of the following combinations of sex chromosomes produce a male child : XX or XY?
The sex of a child is determined by which of the following?
A zygote which has inherited an X chromosome from the father will develop into :
(a) baby boy
(b) baby girl
(c) adult
(d) either boy or girl
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Heterosomes
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How drones are produced in honey bees?
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Identify the organism in which ZZ-ZW type of sex determination is observed.
Grasshopper is an example of XO type of sex determination in which the males have ______.
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Name the two types of gametes produced by men.
Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental ones, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However in human beings, the sex of an individual is largely determined genetically.
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- Citing two examples, justify the statement "Sex of an individual is not always determined genetically".
OR
Draw a flow chart to show that sex is determined genetically in human beings.
Which pair of sex chromosome will determine a male?
A zygote which has Y chromosome inherited from the father will develop into a ______.
In the ZW–ZZ sex determination system, which sex is heterogametic?
