Top 150+ Solved Heredity and Variation MCQ Questions Answer
Q. 1: 1: 1: 1 ratio shows
a. Monohybrid cross
b. Dihybrid cross
c. Back cross
d. Dihybrid test cross
e. cessive
Q. In a plant, gene "T" is responsible for tallness and its recessive allele "t" for dwarfness and "R" is reponsible for red colour flower and its recessive allele "r" of white flower colour. A tall and red flowered plant with genotype TtRr crossed with dwarf and red flowered ttRr. What is the percentage of dwarf - white flowered offspring of above cross ?
a. 50%
b. 6.25%
c. 12.5 %
d. 50 %
e. cessive
Q. In Mirabilis plant the appearance of the pink hybrid (Rr) between cross of a red (RR) and white (rr) flower parent indicates
a. Segregation
b. Dominance
c. Incomplete dominance
d. Heterosis
e. cessive
Q. If there were only parental combinations in F2 of a dihybrid cross then Mendel might have discovered ?
a. Independent assortment
b. Atavism
c. Linkage
d. Repulsion
e. cessive
Q. Medelian dihybrid and dihybrid with linkage are respectively related with how many chromosomes?
a. 1 pair & 2 pair
b. 2 pair & 1 pair
c. 2 pair & 2 pair
d. 1 pair & 1 pair In dihybrid with linkage , 2 pairs of genes located in similar homobgous chromosomes
e. cessive
Q. If distance between gene on chromosome in more , then gene shows :-
a. Less Linkag
b. strong linkage
c. weak linkage
d. incomplete linkage
e. cessive
Q. Which of the following conditions represent a case of co- dominant genes ?
a. A gene expresses itself , suppressing the phenotypic effect of its alleles.
b. enes that are similar in phenotypic effect when present separately, but when together interact to produce a different trait.
c. Alleles, both of which interact to produce effect in homozygous condition
d. Alleles, both of which interact to produce an independent effect in heterozygous condition.
e. cessive
Q. A gene located an y - chromosome and therefore, transmitted from father to son is known as
a. Supplementary gene
b. Complementary gene
c. Duplicate gene
d. Holandric gene
e. cessive
Q. In multiple allele system a gamete possesses
a. 2 alleles
b. 3 alleles
c. one allele
d. several alleles
e. cessive
Q. Blood grouping in humans is controlled by
a. 4 alleles in which IA is dominant
b. 3 alleles in which IA and IB are dominant
c. 2 alleles in which none is dominant
d. 3 alleles in which IA is recessive
e. cessive
Q. Muliple alleles are present
a. in different chromosomes
b. at different loci on chromosomes
c. at the same locus on homologous chromosome
d. at the non homologous chromosome
e. cessive
Q. what is called pleiotropism ?
a. Phenomenon of multiple effect of a simple gene
b. Phenomenon of multiple effect of multiple genes
c. Phenomenon of multiple effect of multiple alleles
d. all of the above
e. cessive
Q. In a family, father has a blood group 'A' and mother has a blood group 'B', Children show 50 % probability for a blood group "AB" indicate that -
a. Father is heterozygous
b. Mother is heterozygous
c. Either of parent is heterozygous
d. Mother is homozygous
e. cessive
Q. The longer the chromosome of an organism, the more genetic variability it gets from,
a. Independent assortment
b. Linkage
c. Crossing over
d. Mutation.
e. cessive
Q. Which statement is incorrect about linkage ?
a. It helps in maintaining the valuable traits of new varieties.
b. It helps in forming new recombinants.
c. Knowledge of linkage helps the breeder to combine all desirable traits in a single variety.
d. It helps in locating genes on chromosome.
e. cessive