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प्रश्न
With the help of a chart, explain the method of sex determination in honeybees.
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उत्तर
In the honeybee, the haplodiploid sex-determination system determines the sex of the offspring. In this system, sex is determined by the number of sets of chromosomes an individual receives. An offspring developed from fertilized egg develops as a female and unfertilized egg develops in males. A female offspring shows diploid (2n = 32) number of chromosomes. Males (drones) produced by means of parthenogenesis have haploid (n = 16) number of chromosomes
SEX DETERMINATION
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संबंधित प्रश्न
Which of the following combinations of sex chromosomes produce a male child : XX or XY?
In a human, how many chromosmes are present in an egg which has just been produced by the ovary?
The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosome D in half of gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, combination of B and E chromosomes produces a male zygote.
(a) What are chromosomes (i) B (ii) D, and (iii) E?
(b) Out of B, D and E, which two chromosomes are of the same type?
(c) Which chromosome is smaller in size?
(d) What is the general name of chromosomes such as B and E?
(e) Out of the two persons A and C, which one is (i) male, and (ii) female?
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
Define the following:
Sex-linked characters
Which of the following is incorrect regarding ZW-ZZ type of sex determination?
Distinguish between heterogametic and homogametic sex determination systems.
Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).
Grasshopper is an example of XO type of sex determination in which the males have ______.
What is sex determination? Explain the mechanism of sex determination in the case of birds.
