A woman with two genes for haemophilia and a gene for colour blindness on one of the 'X' chromosomes marries a normal man. How will the progeny be
[1998]
Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino? [
1998]
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Crossing over in diploid organism is responsible for
[1998]
How many genome types are present in a typical green plant cell?
[1998]
If Mendel had studied the 7 traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different ?
[1998]
How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype : AABbCc?
[1998]
Molecular weight of chromosome of yeast cell is
[1999]
Which of the following is the main category of mutation?
[1999]
In hybridisation Tt × tt gives rise to the progeny of ratio
[1999]
Phenomenon of ‘ Industrial melanism ’ demonstrates
[1999]
One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following informations is most appropriate?
[1999]
Red-green colour blindness in humans is governed by a sex-linked recessive gene. A normal woman whose father was colour blind marries a colour blind man. What proportion of their daughters is expected to be colourblind?
[1999]
How many base pairs are found in one genome of man? [1999]
Drosophila flies with XXY genotype are females but in case of humans, such individuals are abnormal males (Klinefelter's syndrome). This indicates that
[2000]
Mongoloid idiocy in humans is also known as
[2000]
Which one pair of the following parents is most likely to get a child who suffer from hemolytic disease of new born?
[2000]
Which character studied by Mendel in garden pea (Pisum sativum) was dominant
[2000]
In a certain plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t) .If a plant with RRTt genotype is crossed with a plant rrtt genotype , what will be the percentage of tall plants with red fruits in the progeny ?
[2000, 04]
Independent assortment of genes does not take place when
[2001]
When dominant and recessive alleles express itself together it is called [2001]
Ratio of complementary genes
[2001]
Forthcoming generation are less adaptive than their parental generation due to
[2001]
Extranuclear inheritance occurs in
[2001, 04]
Two non-allelic genes produce new phenotype when present together but fail to do so independently are called?
[2001]
Probability of four sons to a couple is
[2001]