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प्रश्न
What is heterogamety ? Explain the mechanism of sex determinatin in Drosophila.
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उत्तर
Heterogamety - Either male or female individual produces two different types of gametes.
Mechanism of sex determination in Drosophila. In Drosophila, the males have one X and one Y chromosome, whereas females have a pair of X-chromosomes besides autosomes.
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संबंधित प्रश्न
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
(i) Female XX with Male XO
(ii) Female ZW with Male ZZ
Fill in the following blank with suitable word :
Genes always work in ................ .
In a human, how many chromosmes are present in a fertilised egg?
There are five daughters and no son in a family. It is because
ZZ/ZW type of sex determination is seen in ______.
Which of the following is incorrect regarding ZW - ZZ type of sex determination?
The maleness of a child is determined by ______
Which of the following statements is not true with respect to variation?
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
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.
- In what way are the sex chromosomes 'X' and 'Y' different in size? Name the mismatched pair of sex chromosome in humans.
- Write the number of pair/pairs of sex chromosomes present in human beings. In which one of the parent (male/female) perfect pair/pairs of sex chromosome are present?
- 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.
