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प्रश्न
Differentiate between ‘ZZ’ and ‘XY’ type of sex-determination mechanisms.
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उत्तर
| ZZ Sex-Determination Mechanism | XY Sex-Determination Mechanism |
| In this type of chromosomal sex determination mechanism, the females are heterogametic, that is, they produce two types of gametes, while the males are homogametic. | In this type of chromosomal sex determination mechanism, the males are heterogametic, that is, they produce two types of gametes, while the females are homogametic. |
| Here, the females produce two types of eggs (A + Z) and (A + W), while the males produce only one type of sperm (A + Z). | Here, the males have an X chromosome and its counterpart Y chromosome, which is distinctly smaller. Hence, the males are XY. However, females have a pair of X chromosomes; therefore, they are XX. |
| Organisms that have the ZZ type of sex-determination mechanism are birds, fishes, some reptiles, etc. | Organisms that have the XY type of sex-determination mechanism are humans and Drosophila. |
संबंधित प्रश्न
Explain sex determination in human beings.
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.
What are the chromosomes XY and XX known as?
In a human, how many chromosmes are present in a sperm in the testes?
In a human, how many chromosmes are present in a fertilised egg?
________ shows haplo-diploid type of sex-determination.
What is heterogamety ? Explain the mechanism of sex determinatin in Drosophila.
Choose the correct answer:
Chromosomes identical in male and female are called __________
What is Lyonisation?
Explain the mode of sex determination in honeybees.
Which of the following decides the sex of the child?
Human offspring’s sex is determined ______
The maleness of a child is determined by ______
If a normal cell of the human body contains 46 pairs of chromosomes then the numbers of chromosomes in a sex cell of a human being is most likely to be ______
The number of pair (s) of sex chromosomes in the zygote of humans is
What did H. Henking originally call the nuclear structure he discovered during his 1891 study of squash bug spermatogenesis?
In the XX–XO sex determination system, what does the 'O' represent?
In the haplodiploidy system observed in honeybees, unfertilized eggs develop into which type of individual?
