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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
Explain sex determination in human beings.
If X chromosome is inherited from mother and Y from father, the offspring will be male.
How is the sex of the child determined in human beings?
There are ................ pairs of chromosomes in the human being.
There are two sets of chromosomes in the zygote.
In a human, how many chromosmes are present in a skin cell?
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.
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
Choose the correct answer from the four options given below :
In a human male, a sperm will contain :
What is heterogamety ? Explain the mechanism of sex determinatin in Drosophila.
Define the following:
Sex chromosomes
Write the functional activity of the following structure:
Heterosomes
Explain the mode of sex determination in honeybees.
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
A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.
How many types of gametes are produced by a human female?
All human chromosomes ate not paired. Most human chromosomes have a maternal and a paternal copy, and we have 22 such pairs. But one pair called the sex chromosomes, is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes. But men have a mismatched pair in which one is normal sized while the other is a short one.
(a) In humans, how many chromosomes are present in a Zygote and in each gamete?
(b) A few reptiles rely entirely on environmental cues for sex determination. Comment.
(c) "The sex of a child is a matter of chance and none of the parents are considered to be responsible for it." Justify it through flow chart only.
OR
(c) Why do all the gametes formed in human females have an X chromosome?
Which pair of sex chromosome will determine a male?
