EASY
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Important Questions on Genetics: Mendel’s Laws of Inheritance and Sex Linked Inheritance of Diseases

EASY
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

Flow chart of sex determination in humans is given below. Information to be filled in the blanks a, b and c respectively are :

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EASY

In which of the organism, the following type of sex determination is possible

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MEDIUM
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?
EASY
From the chromosomal complements given below, identify the one which shows female heterogamety.
MEDIUM
Read the following statements :-

a. In both grasshopper and Drosophila males have only one X chromosome in their cells.

b. I gene of Lac operon is expressed only in presence of lactose

c. Being repetitive, satellite DNA forms multiple copies of same polypeptide

d. Random arrangement of chromosomes at metaphasic plate of meiosis I is the basis of independent assortment of genes.

The correct statements are
MEDIUM
Match the following columns.
 
  Column-I   Column- II
(A) XX-XY method of sex determination (1) Female heterogametic
(B) 1.5 XA ratio (2) Turner’s syndrome
(C) Karyotype 45 (3) Male heterogametic
(D) ZW-ZZ method of sex determination (4) Metafemale
HARD
Sex determination in an organism is given by XA=1.5, then organism will be: