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प्रश्न
Explain the haplo-diploid method of sex determination in the honey bee.
उत्तर
Haplo-diploid method of sex determination in the honey bee:
- 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 worker or queen bee depending on the food they consume during their development.
- Diploid larvae which get royal jelly as food develops into queen (fertile female) and other develops into workers (sterile females).
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संबंधित प्रश्न
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?
Choose the correct answer:
A single recessive trait, able to express must be on _________
In which livings, female decides the sex? Give two examples.
Which of the following is incorrect regarding ZW-ZZ type of sex determination?
ZZ / ZW type of sex determination is seen in ______.
A zygote which has an X-chromosome inherited from the father will develop into a ______.
The maleness of a child is determined by ______
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
The number of pair (s) of sex chromosomes in the zygote of humans is
