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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
If X chromosome is inherited from mother and Y from father, the offspring will be male.
Explain the mechanism of sex determination in birds.
How is the sex of the child determined in human beings?
Explain how, sex is determined in human babies.
If a normal human cell has 46 chromosomes, how many chromosomes will be there in a human (i) sperm cell, and (ii) zygote?
In a human, how many chromosmes are present in an egg which has just been produced by the ovary?
The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed
The two versions of a trait (character) which are brought in by the male and female gametes are situated on :
(a) copies of the same chromosome
(b) sex chromosomes
(c) two different chromosomes
(d) any chromosomes
E is the gene for brown eye colour and an is the gene for blue eye colour. which gene is (1) recessive, and (2) dominant?
________ shows haplo-diploid type of sex-determination.
Define the following:
Autosomes
In which livings, female decides the sex? Give two examples.
Complete the following sentence with appropriate word:
___________ chromosomes do not take part in sex determination.
Which of the following develops through parthenogene is?
The maleness of a child is determined by ______
A zygote which has an X-chromosome inherited from the father will develop into a
The chromosomal constitution of a human female can be written as ______
Name the two types of gametes produced by men.
What is sex determination? Explain the mechanism of sex determination in the case of birds.
