Advertisements
Advertisements
Question
Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?
Advertisements
Solution
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
RELATED QUESTIONS
What is amniocentesis and why there is a statutory ban on it?
What is the causative organism for the following disease?
Gonorrhoea
Name one sexually transmitted disease for which no definite cure has been found so far. What is the causative organism of this disease?
People who die from AIDS are not killed by the virus itself. Explain.
A woman uses a device X made of a common metal for preventing pregnancy. This device works by preventing the implantation of fertilised egg cell (or embryo) in the female organ Y.
(a) What are the two names of device X?
(b) Name the organ Y.
(c) Can this method of contraception protect a woman from acquiring a STD?
Name the kind of diseases/disorders that are likely to occur in humans if
(i) mutation in the gene that codes for an enzyme phenyl alanine hydrolase occurs,
(ii) there is an extra copy of chromosome 21,
(iii) the karyotype is XXY.
What is contraception ? List three reasons for adopting contraceptive methods.
Name the kind of diseases/disorders and any two symptoms that are likely to occur in humans if Mutation in the gene that codes for an enzyme phenylalanine hydroxylase occurs.
What can you suggest to your classmates to keep himself/herself clean and healthy?
Which one amongst the following is the first country in the world to initiate action plans and programmes at a national level to attain total reproductive health as social goal?
‘Saheli’ a new oral contraceptive developed by ______.
A dark stained body present in the somatic cells of human female but absent from those of male is ______.
Why does bread mould grow profusely on a moist slice of bread rather than on a dry slice of bread?
What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?
When was family planning programs initiated in India?
What is the full form of RCH?
Comment on the Reproductive and Child Health Care programme of the government to improve the reproductive health of the people.
What is the primary rationale for introducing structured sex education in schools under the RCH programme?
Which initiative was introduced into the National Programme in 1995 to provide safe, side-effect-free contraception to women?
