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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
What are the chromosomes XY and XX known as?
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
Which combination of genes in the zygote will produce children with blue eyes?
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
Choose the correct answer :
Human sex chromosomes are __________
Drone of the honeybees shows haploid number of chromosomes. Illustrate.
In which livings, female decides the sex? Give two examples.
Write a short note on sex determination in man.
Explain the mechanism of sex determination in birds.
Differentiate Intersexes from Supersexes.
Identify the female heterogamety from the chromosomal complements given below.
Read the following statements and select the correct option.
i. If sperm containing Y chromosome fertilizes the ovum, then diploid zygote is formed that grows into a male child.
ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.
Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).
Which of the following organisms has haploid number of chromosomes?
Which of the following determines the sex of a child?
A zygote which has an X-chromosome inherited from the father will develop into a
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
How many types of gametes are produced by a human female?
The sex chromosome in a human ovum is ______.
A zygote which has Y chromosome inherited from the father will develop into a ______.
