EASY
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Barr body in human female is formed by

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Important Questions on Principles of Inheritance and Variation

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Select the incorrect statement?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Study the following regarding genic balance theory of sex determination in Drosophila
I. Organism with AAA XXX is fertile triploid female
II. Organism with AAA XXY is fertile triploid male
III. Organism with AAA XX is an intersex
IV. Organism with AA XXY is metafemale
Which of the above are correct?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Assertion (A): Amniocentesis is used to detect the chromosomal defects if any, in the developing foetus.
Reason (R): Amniocentesis is a cytological study of the foetal cells for abnormal chromosomes.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
In a certain taxon of insects (Example: Cockroach), some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosomes bearing organisms are _________
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Give one reason to justify the statutory ban of amniocentesis.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Assertion (A): In human beings, the sex of the offspring depends on the type of sperm that fertilizes the ovum
Reason (R): Human males are heterogametic
The correct option among the following is
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
What is meant by royal jelly?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
In the context of Amniocentesis, which of the following statement is incorrect?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Define and give the role of amniocentesis.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination

Explain the sex determination process in humans with the help of ray diagram.

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
From the chromosomal complements given below, identify the one which shows female heterogamety.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
What is amniocentesis? Why does amniocentesis is banned?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Which of the following organisms produce sperm without involving meiosis?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Sterile female bees are
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
How does sex determination take place in humans?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Discuss the role of chromosomes other than the sex-chromosome in the determination of sex.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Amniocentesis is a diagnostic procedure to detect
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Haplo-diploid insects have diploid females from fertilized eggs but haploid males from unfertilized ones. Such a haploid male with red eyes is crossed with a white-eyed female. Assuming that the red-eye colour mutation is dominant over the white-eye colour, which one of the following statements is true?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Sex Determination
Select the incorrect statement.