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प्रश्न
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
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उत्तर
As a rule the heterogametic organism determines the sex of the unborn child. In case of humans, since males are heterogametic it is the father and not the mother who decides the sex of the child. In some animals like crocodiles, lower temperature favour hatching of female offsprings and higher temperatures lead to hatching of male offsprings.
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संबंधित प्रश्न
There are ................ pairs of chromosomes in the human being.
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are :
(i) large chromosome
(ii) small chromosome
(iii) Y chromosome
(iv) X chromosome
A couple with a newborn baby is troubled that the child does not resemble either of them. Suspecting that a mixup occurred at the hospital, they check the blood type of the infant. It is type O. Because the father is type A and the mother type B, they conclude that a mixup has definitely occurred. Are they correct? Give reason for your answer.
Answer the following question:
How is sex determined in human beings? Explain with the help of a diagram.
Write a short note on sex determination in man.
Complete the following sentence with appropriate word:
___________ chromosomes do not take part in sex determination.
Explain the haplo-diploid method of sex determination in the honey bee.
Explain the mechanism of sex determination in birds.
How many ovum are formed when a diploid cell undergoes meiosis, during oogenesis?
Match the items of Column I with Column II:
| Column I | Column II | ||
| i. | XX-XO method of Sex Determination | a. | Turner syndrome |
| ii. | XX-XY method of Sex Determination | b. | Female heterog ametic |
| iii. | karyotype-45 | c. | Grasshopper |
| iv. | ZW-ZZ method of Sex Determination | d. | Female homogametic |
Number of autosomes present in liver cells of a human female is ______.
Which of the following is an example of genetic variation?
Human offspring’s sex is determined ______
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 maleness of a child is determined by
Which of the following statements is not true with respect to variation?
Which pair of sex chromosome will determine a male?
A zygote which has Y chromosome inherited from the father will develop into a ______.
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
