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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
There are ................ pairs of chromosomes in the human being.
Explain how, sex is determined in human babies.
In a human, how many chromosmes are present in an egg which has just been produced by the ovary?
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
The sex of a child is determined by which of the following?
(a) the length of the mother's pregnancy
(b) the length of time between ovulation and copulation
(c) the presence of and X chromosome in an ovum
(d) the presence of a Y chromosome in a sperm
A zygote which has inherited an X chromosome from the father will develop into :
(a) baby boy
(b) baby girl
(c) adult
(d) either boy or girl
Name any two genetic in humans.
Explain the following terms:
Identical twins
Distinguish between heterogametic and homogametic sex determination systems.
What is Lyonisation?
Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).
Identify the organism in which ZZ-ZW type of sex determination is observed.
ZZ/ZW type of sex determination is seen in ______.
In XO type of sex determination ______.
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 ______
A zygote which has an X-chromosome inherited from the father will develop into a
A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
