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प्रश्न
Answer the following question:
How is sex determined in human beings? Explain with the help of a diagram.
उत्तर
- In human beings, the gametes from the male parent decide the sex of the baby.
- In human beings, there are 22 pairs of autosomes and 1 pair of sex chromosomes.
- In human male gametes, two dissimilar sex chromosomes XY are present whereas in females two similar sex chromosomes XX are present.
- All children inherit 'X' chromosomes from their mother and 'X or 'Y' from their father.
- If it is X chromosome from father, then the offspring will be a daughter, and if 'Y' chromosomes, then it will be a son.
- Hence, the gametes from the male parent decide the sex of the baby.
APPEARS IN
संबंधित प्रश्न
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.
Fill in the following blank with suitable word :
Genes always work in ................ .
In a human, how many chromosmes are present in an egg which has just been produced by the ovary?
The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed
The exchange of genetic material takes place in :
(a) vegetative reproduction
(b) asexual reproduction
(c) sexual reproduction
(d) budding
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
Which combination of genes in the zygote will produce children with blue eyes?
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?
Explain the following terms:
Identical twins
Choose the correct answer:
Males have more chances of suffering from sex-linked disease because of ___________
With the help of a chart, explain the method of sex determination in honeybees.
Write a short note on sex determination in man.
Give Technical Term:
The cell which determines the sex of a baby.
Explain the haplo-diploid method of sex determination in the honey bee.
Explain the mechanism of sex determination in birds.
What is haplodiploidy?
How is sex determined in human beings?
Identify the female heterogamety from the chromosomal complements given below.
From the following which option correctly represents the normal genetic constitution of a ovum?
Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).
The ‘X’ body of Henking was observed in ______.
Grasshopper is an example of XO type of sex determination in which the males have ______.
Human offspring’s sex is determined ______
Structures present in a cell which is responsible for determination of the sex of a baby is
Name the two types of gametes produced by men.
Which pair of sex chromosome will determine a male?
The sex chromosome in a human ovum is ______.
