Advertisements
Advertisements
प्रश्न
Explain the mode of sex determination in honeybees.
Advertisements
उत्तर
In hymenopteran insects such as honeybees, ants and wasps, a mechanism of sex determination called haplodiploidy mechanism of sex determination is common. In this system, the sex of the offspring is determined by the number of sets of chromosomes it receives. Fertilized eggs develop into females (Queen or Worker) and unfertilized eggs develop into males (drones) by parthenogenesis. It means that the males have half the number of chromosomes (haploid) and the females have double the number (diploid), hence the name haplodiploid for this system of sex determination.
This mode of sex determination facilitates the evolution of sociality in which only one diploid female becomes a queen and lays the eggs for the colony. All other females which are diploid having developed from fertilized eggs help to raise the queen’s eggs and so contribute to the queen’s reproductive success and indirectly to their own, a phenomenon known as Kin Selection. The queen constructs their social environment by releasing a hormone that suppresses fertility of the workers.
संबंधित प्रश्न
There are two sets of chromosomes in the zygote.
Fill in the following blank with suitable word :
The...............chromosomes for a ............are XX whereas that for a ..............are XY.
Explain how, sex is determined in human babies.
Write the functional activity of the following structure:
Heterosomes
How drones are produced in honey bees?
How many ovum are formed when a diploid cell undergoes meiosis, during oogenesis?
Which type of sex determination is observed in honey bee?
The maleness of a child is determined by ______
Structures present in a cell which is responsible for determination of the sex of a baby is ______.
In 1891, H. Henking studied spermatogenesis in squash bugs and observed that a specific nuclear structure was present in what percentage of the resulting sperms?
