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प्रश्न
Explain the haplo-diploid method of sex determination in the honey bee.
Explain Haplodiploidy in honey-bees.
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उत्तर १
- In honey bees, the chromosomal mechanism of sex determination is of haplo-diploid type.
- In this type, the sex of the individual is determined by the number of the set of chromosomes received.
- Females are diploid (2n = 32) and males are haploid (n = 16).
- The female produces haploid eggs (n = 16) by meiosis and male produces haploid sperms (n = 16) by mitosis.
- If the egg is fertilized by sperm, the zygote develops into a diploid female (2n = 32) (queen and worker), and an unfertilized egg develops into a haploid male (n = 16) (Drone) by way of parthenogenesis.
- The diploid female gets differentiated into either a worker or a queen bee depending on the food they consume during their development.
- Diploid larvae that get royal jelly as food develop into queens (fertile females) and others develop into workers (sterile females).
उत्तर २
In honey bees, haplodiploidy is a sex determination method in which an individual’s sex is dictated by the number of sets of chromosomes they are given.
In honey bees:
- Queen and worker bees are diploid, meaning they have two sets of chromosomes, and they develop from fertilized eggs.
- Male drones develop from unfertilized eggs and have one pair of chromosomes, making them haploid. According to this arrangement, females receive two sets of chromosomes, one from the queen and one from a male drone, while males receive only one, which is fully inherited from the queen.
Haplo-diploid sex determination system:
संबंधित प्रश्न
Which of the following is an example of ZW – ZZ type of mechanism of sex determination?
There are ................ pairs of chromosomes in the human being.
A new born child has an XY pair of chromosmes. Will it be a baby boy or a baby girl?
A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes in a sex cell (sperm or ovum) of a human being is most likely to be :
(a) 46
(b) 23
(c) 21
(d) 42
Which combination of genes in the zygote will produce children with blue eyes?
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.
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?
A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness in them.
Who is colour blind in the parents – the Father or the Mother?
With the help of a chart, explain the method of sex determination in honeybees.
What is parthenogenesis?
Explain the mechanism of sex determination in birds.
From the following which option correctly represents the normal genetic constitution of a ovum?
Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).
A zygote which has an X-chromosome inherited from the father will develop into a ______.
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
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
What did H. Henking originally call the nuclear structure he discovered during his 1891 study of squash bug spermatogenesis?
In the haplodiploidy system observed in honeybees, unfertilized eggs develop into which type of individual?
