A and B genes are linked what shall be genotype of progeny in a cross between AB/ab and ab/ab?
[2001]
In humans, male XXY and female XXXX occur due to
[2001]
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No. of barr body present in each somatic cell of a female is
[2001]
Which of the following is correct match?
[2002]
Which of the following is an example of sex linked disease?
[2002]
Which of the following is an example of pleiotropic effect?
[2002]
A gene is said to be dominant if
[2002]
A diseased man marries a normal woman. They have three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is
[2002]
On selfing a plant of F1 generation with genotype “AABbCC”,the genotypic ratio in F2 generation will be
[2002]
There are three genes a, b, c. Percentage of crossing over between a and b is 20%, b and c is 28% an a and c is 8%. What is the sequence of genes on chromosome?
[2002]
In Drosophila, the sex is determined by
[2003]
Genes for cytoplasmic male sterility in plants are generally located in
[2003, 05]
Nicotiana sylvestris flowers only during long days and N. tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross fertilized to produce self – fertile offspring. What is the best reason for considering N. sylvestris and N. tabacum to be separate species ?
[2003]
Which one of the following traits of garden pea studied by Mendel was a recessive feature ?
[2003]
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes ?
[2003]
Two crosses between the same pair of genotypes or phenotypes in which the source of the gametes are reversed in one cross, is known as
[2003]
The linkage map of X-chromosome of fruit fly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two genes (y and b) should be
[2003]
Christmas disease is another name for
[2003]
Pattern baldness, moustaches and beard in human males are examples of
[2003]
Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
[2003]
Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to
[2004]
The recessive genes located on X-chromosome in humans are always
[2004]
A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh?
[2004]
A normal woman, whose father was colourblind is married to a normal man. The sons would be
[2004]
One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in
[2004]