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प्रश्न
What is haplodiploidy?
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उत्तर
In haplodiploidy, 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).
संबंधित प्रश्न
Which of the following is an example of ZW – ZZ type of mechanism of sex determination?
Drone of the honeybees shows haploid number of chromosomes. Illustrate.
ZW-ZZ system of sex determination occurs in
What is Lyonisation?
Which of the following is incorrect regarding ZW - ZZ type of sex determination?
Select the statements that describe characteristics of genes
- genes are specific sequence of bases in a DNA molecule
- a gene does not code for proteins
- in individuals of a given species, a specific gene is located on a particular chromosome
- each chromosome has only one gene
Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental ones, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However in human beings, the sex of an individual is largely determined genetically.
- In what way are the sex chromosomes 'X' and 'Y' different in size? Name the mismatched pair of sex chromosome in humans.
- Write the number of pair/pairs of sex chromosomes present in human beings. In which one of the parent (male/female) perfect pair/pairs of sex chromosome are present?
- Citing two examples, justify the statement "Sex of an individual is not always determined genetically".
OR
Draw a flow chart to show that sex is determined genetically in human beings.
What is the probability of a girl or a boy being born into a family? Justify your answer.
A zygote which has Y chromosome inherited from the father will develop into a ______.
Which of the following organisms exhibits the XX–XY sex determination system?
