A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of
(1) 1 : 2 : 1 :: Tall heterozygous : tall homozygous : Dwarf
(2) 3 : 1 :: Tall : Dwarf
(3) 3 : 1 :: Dwarf : Tall
(4) 1 : 2 : 1 :: Tall homozygous : Tall heterogygous : Dwarf
In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates
(1) chromosomes failed to separate during meiosis
(2) the two genes are linked and present on the same chromosome
(3) both of the characters are controlled by more than one gene
(4) the two genes are located on two different chromosomes
The term "linkage" was coined by :-
1. TH Morgan
2. T Boveri
3. G Mendel
4. W Sulton
A pleiotropic gene
1. is expressed only in primitive plants
2. is a gene involved during Pliocene
3. controls a trait only in combination with another gene
4. control multiple traits in an individual
A human female with turner's syndrome
(1) has 45 chromosomes with XO
(2) has one additional X-chromosome
(3) exhibits male characters
(4) is able to produce children with normal husband
If two persons 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of
(1) codominance
(2) incomplete dominance
(3) partial dominance
(4) complete dominance
The incorrect statement with regard to haemophilia is
(1) it is a sex-linked disease
(2) it is a recessive disease
(3) it is a dominant disease
(4) a single protein involved in the clotting of blood effected
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1:2:1. It represents a case of
(1) codominance
(2) dihybrid cross
(3) monohybrid cross with complete dominance
(4) monohybird cross the incomplete dominance
Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
(1) The discrete unit controlling a particular character is called a factor
(2) Out of one pair of factors one is dominant, and the other is recessive
(3) Alleles do not show any blendings and both the characters recover as such in F2 generation.
(4) Factors occur in pairs
ABO blood groups in humans are controlled by the gene I. It has three alleles — IA, IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
(1) Three
(2) One
(3) Four
(4) Two