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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 the mechanism of sex determination in birds.
Which of the following is an example of ZW – ZZ type of mechanism of sex determination?
There are two sets of chromosomes in the zygote.
Explain how, sex is determined in human babies.
The number of pair(s) of sex chromosomes in the zygote of humans is ______.
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
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are:
- large chromosome
- small chromosome
- Y chromosome
- X chromosome
Name two animals which have nineteen pairs of chromosomes.
Name any two genetic in humans.
Choose the correct answer from the four options given below :
In a human male, a sperm will contain :
Define the following:
Sex chromosomes
Choose the correct answer:
Males have more chances of suffering from sex-linked disease because of ___________
Choose the correct answer:
A man can transfer his sex-linked gene to his ______________
Write a short note on sex determination in man.
A zygote which has an X-chromosome inherited from the father will develop into a ______.
Human offspring’s sex is determined ______
Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that
Given below are two statements:
Statement - I: The male Drosophila has a pair of homomorphic sex chromosomes.
Statement - II: The male human being has a pair of heteromorphic sex chromosomes.
In the light of above statements, Choose the most appropriate answer from the options given below:
Which of the following organisms exhibits the XX–XY sex determination system?
In the haplodiploidy system observed in honeybees, fertilized eggs develop into which type of individual?
