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The AA+ XO type of chromosome constitution is seen in :

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Important Questions on Heredity and Variation

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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
XO type of sex determination can be found in:
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
From the chromosomal complements given below, identify the one which shows female heterogamety.
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Biology>Genetics and Evolution>Heredity 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 _________
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination

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

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Biology>Genetics and Evolution>Heredity 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?
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
Select the incorrect statement.
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
How many chromosomes are present in an unfertilized egg
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
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
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
Autosome is
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
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
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
ZZ/ZW type of sex determination is seen in
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
Gynandromorph or sex mosaic is produced by
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
Sex determination in an organism is given by XA=1.5, then organism will be:
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
The chromosome complement of the somatic cells in all human being is
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
Heterogametic male condition does not occur in
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
Number of autosomes in human sperm is:
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
In the XX-XO type of sex determination
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
What are allosomes?
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
Edward's syndrome, Patau's syndrome and Down's syndrome are due to:
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Biology>Genetics and Evolution>Heredity and Variation>Sex Determination
In man, the usual number of chromosomes is: