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Questions
Explain the haplo-diploid method of sex determination in the honey bee.
Explain Haplodiploidy in honey-bees.
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Solution 1
- 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).
Solution 2
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:
RELATED QUESTIONS
Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.
Which of the following is an example of ZW – ZZ type of mechanism of sex determination?
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
Fill in the following blank with suitable word :
The...............chromosomes for a ............are XX whereas that for a ..............are XY.
The number of pair(s) of sex chromosomes in the zygote of humans is :
(a) one
(b) two
(c) three
(d) four
The two versions of a trait (character) which are brought in by the male and female gametes are situated on :
(a) copies of the same chromosome
(b) sex chromosomes
(c) two different chromosomes
(d) any chromosomes
Does the sex of the child depend on the father or it is just a matter of chance? Discuss.
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?
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
Choose the correct answer:
Males have more chances of suffering from sex-linked disease because of ___________
Explain the mechanism of sex determination in humans with a suitable chart.
XO type of sex determination and XY type of sex determination are examples of ____________.
What is haplodiploidy?
Read the following statements and select the correct option.
i. If sperm containing Y chromosome fertilizes the ovum, then diploid zygote is formed that grows into a male child.
ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.
Identify the organism in which ZZ-ZW type of sex determination is observed.
Which of the following decides the sex of the child?
Fill the blank circles in figure and identify the sex of child A and B.
Name the two types of gametes produced by men.
