Advertisements
Advertisements
प्रश्न
Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?
उत्तर
Sexually reproducing organisms produce gametes through meiosis as a result they receive only half the number of chromosomes and half the amount of DNA as compared to the non reproductive body cells.When these gametes from two individuals combine during sexual reproduction to form a new individual, the original number of chromosomes and the DNA content in the new generation are restored.
APPEARS IN
संबंधित प्रश्न
Amniocentesis for sex determination is banned in our country. Is this ban necessary? Comment.
Answer the following question.
What is meant by contraception?
Give two examples of sexually transmitted diseases.
A, B and C are three common STDs. A and C are caused by bacteria whereas B is caused by a virus D. The virus D reduces the immunity of the infected person to such a low level that the person can die of even very mild diseases.
(a) What could A and C be?
(b) What is B?
(c) Name the virus D?
(d) How can A, B and C be caused?
(e) Out of A, B and C, which one does not have a definite cure as yet?
Mention any one symptom of the diseases/disorders named above.
What can you suggest to your classmates to keep himself/herself clean and healthy?
What is the need for contraception?
The family planning programmes in India were initiated in ______.
RCH stands for ______.
In India, the action plans for family planning were initiated in the year ______
