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प्रश्न
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
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उत्तर
T. H. Morgan selected Drosophila melanogaster to study sex-linked genes in his lab experiment due to the following reasons:
(i) Drosophila melanogaster has short life cycle, high reproductive rate and has sex chromosomes similar to that of humans, that is, females have XX chromosomes while males have XY chromosomes (however, their sex determination mechanism is different from humans).
(ii) Sex-linked traits such as red eye colour and white eye colour are found only in Drosophila melanogaster, where white eye colour in males is a sex-linked recessive trait.
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संबंधित प्रश्न
Explain how, sex is determined in human babies.
A zygote which has inherited an X chromosome from the father will develop into :
(a) baby boy
(b) baby girl
(c) adult
(d) either boy or girl
Name two animals which have nineteen pairs of chromosomes.
Brief about female heterogamety.
Identify the female heterogamety from the chromosomal complements given below.
A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
Which of the following determines the sex of a child?
Sex in honey bee is determined by ______.
Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental ones, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However in human beings, the sex of an individual is largely determined genetically.
- In what way are the sex chromosomes 'X' and 'Y' different in size? Name the mismatched pair of sex chromosome in humans.
- Write the number of pair/pairs of sex chromosomes present in human beings. In which one of the parent (male/female) perfect pair/pairs of sex chromosome are present?
- Citing two examples, justify the statement "Sex of an individual is not always determined genetically".
OR
Draw a flow chart to show that sex is determined genetically in human beings.
A zygote which has Y chromosome inherited from the father will develop into a ______.
