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Question
What is heterogamety ? Explain the mechanism of sex determinatin in Drosophila.
Solution
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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RELATED QUESTIONS
Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.
Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form.
Which of the following is an example of ZW – ZZ type of mechanism of sex determination?
A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes in a sex cell (sperm or ovum) of a human being is most likely to be :
(a) 46
(b) 23
(c) 21
(d) 42
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
XO type of sex determination and XY type of sex determination are examples of ____________.
What is haplodiploidy?
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| Column I | Column II | ||
| i. | XX-XO method of Sex Determination | a. | Turner syndrome |
| ii. | XX-XY method of Sex Determination | b. | Female heterog ametic |
| iii. | karyotype-45 | c. | Grasshopper |
| iv. | ZW-ZZ method of Sex Determination | d. | Female homogametic |
The belief that the mother is completely responsible for the sex of the child is wrong because the child
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