Question. Incomplete dominance is similar to codominance in having identical
(a) phenotypic ratio
(b) genotypic ratio
(c) Both (a) and (b)
(d) None of the above

Question. What will be the ratio of offspring in a cross between the red coloured and pink coloured flowers of Mirabilis jalapa.
(a) Red : Pink = 1 : 1
(b) Red : Pink = 3 : 1
(c) Red : Pink = 1 : 3
(d) Red : Pink = 2 : 3

Question. The literal meaning of chromosome is
(a) painted body
(b) coloured body
(c) doubling body
(d) thread-like body

Question. Mendel’s principle of segregation means that the germ cells always receive
(a) one pair to alleles
(b) one quarter of the genes
(c) either one allele of father or one allele of mother
(d) any pair of alleles

Question. The law based on fact that the characters do not show any blending and both the characters are recovered as such in F2-generation although one character was absent in F1-progeny, is
(a) law of purity of gametes
(b) law of independent assortment
(c) law of incomplete dominance
(d) law of dominance

Question. The ABO blood groups are controlled by
(a) I-gene
(b) c-gene
(c) B-gene
(d) n-gene

Question. Out of the three alleles of gene I, the sugar polymers on the plasma membrane of RBCs is controlled by how many alleles?
(a) All three
(b) Two
(c) One
(d) O

Question. Blood group of the father is ‘A’ and blood group of mother is ‘B’. Then predict the blood group of the progeny. 
(a) A, AB
(b) A, B, AB, O
(c) B, AB
(d) O, A, B

Question. The genotypes of a husband and wife are I I A B and I i A . Among the blood types of their children, how many different genotypes and phenotypes are possible? 
(a) 3 genotypes; 3 phenotypes
(b) 3 genotypes; 4 phenotypes
(c) 4 genotypes; 3 phenotypes
(d) 4 genotypes; 4 phenotypes

Question. Which of the following characteristics represents ‘Inheritance of blood groups’ in humans? 
I. Dominance
II. Codominance
III. Multiple allele
IV. Incomplete dominance
V. Polygenic inheritance
(a) I, IV and V
(b) I, II and III
(c) II, III and V
(d) I, III and V

Question. When there are more than two alleles controlling the same character. These are called
(a) pleiotropy
(b) polyalleles
(c) multiple alleles
(d) All of these

Question. Which of the following option (s) is/are correct for starch synthesis in pea seeds controlled by single gene which has two allelic forms B and b?
(a) BB is round seed with large starch synthesis
(b) bb is wrinkled seed with large starch synthesis
(c) Bb is round seed with less starch synthesis
(d) All of the above

Question. The concept of chromosome movement during meiosis to explain Mendel’s laws was used by
(a) Sutton and Boveri
(b) Malthus
(c) Correns
(d) Morgan

Question. The recessive trait in case of incomplete dominance is seen due to the
(a) non-functional enzyme produced by modified gene
(b) absence of any enzyme that may otherwise be produced by modified gene
(c) normal or less efficient enzyme produced by recessive allele
(d) Both (a) and (b)

Question. TtRr represents (heterozygous tall, heterozygous pink). If this plant is self crossed then
(T–dominant, t–recessive, R–dominant, r–recessive)
I. 25% plants have red flowers.
II. 25% plants have white flowers.
III. 50% plants have pink flowers.
IV. 50% plants are tall.
Choose the correct option.
(a) I and II
(b) I, II and III
(c) II, III and IV
(d) I, II, III and IV

Question. The allele which expresses itself in both homozygous and heterozygous condition is called
(a) dominant allele
(b) recessive allele
(c) incomplete dominant allele
(d) split allele

Question. Mendel crossed tall and dwarf plant. In F2-generation the observed ratio was 3:1 (tall : short). From this result, he deduced
I. law of dominance.
II. law of independent assortment.
III. law of segregation.
IV. incomplete dominance.
Choose the correct option.
(a) I, II, III and IV
(b) I and III
(c) II, III and IV
(d) I, II and III

Question. Which Mendelian idea is depicted by a cross in which the F
1 -generation resembles both the parents?
(a) Incomplete dominance
(b) Law of dominance
(c) Inheritance of one gene
(d) Codominance

Question. Starch synthesis gene in pea plant in heterozygous condition produces starch grain of intermediate size.
This shows
(a) complete dominance
(b) incomplete dominance
(c) codominance
(d) None of the above

Question. In a cross between plants having yellow round (YYRR) and green wrinkled (yyrr) seeds, what will be the ratio between seeds having yellow and green seed colour?
(a) 3 : 2
(b) 3 : 1
(c) 9 : 7
(d) 7 : 9

Question. Total number of round seed in the F2-generation of a cross between plants having pure yellow round and pure green wrinkled seeds is
(a) 9
(b) 12
(c) 11
(d) 1

Question. Ratio observed in dihybrid cross (phenotypically)
(a) 3 : 1
(b) 1 : 2 : 1
(c) 9 : 7
(d) 9 : 3 : 3 : 1

Question. The number of different genotypes observed in the F2-generation of a dihybrid cross are
(a) 9
(b) 12
(c) 4
(d) 6

Question. Frame-shift mutation arises due to
(a) deletion of base pair of DNA
(b) insertion of base pair of DNA
(c) Both (a) and (b)
(d) change in single base pair of DNA

Question. Pedigree analysis is very important in human beings because
(a) it helps genetic counselors to avoid disorders
(b) it shows origin of traits
(c) it shows the flow of traits in family
(d) All of the above

Question. Mendel’s result on inheritance of characters were rediscovered by
(a) de Vries
(b) Correns
(c) von Tschermak
(d) All of these

Question. The chromosomes as well as genes occur in pair and the two alleles of a gene pair are located on
(a) homologous chromosomes
(b) non-homologous chromosomes
(c) single chromosome
(d) All of the above

Question. Who proposed the chromosomal theory of inheritance?
(a) Sutton and Mendel
(b) Boveri and Morgan
(c) Morgan and Mendel
(d) Sutton and Boveri

Question. Theoretically in incomplete dominance one allele functions as normal, while another allele may function as
(a) normal allele
(b) non-functional allele
(c) normal but less efficient allele
(d) All of the above

Question. In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates
(a) chromosomes failed to separate during meiosis
(b) the two genes are linked and present on the same chromosome
(c) Both of the characters are controlled by more than one gene
(d) the genes are located on two different chromosomes

Question. Mutation is a phenomena which results in alteration in sequences of
(a) DNA
(b) RNA
(c) proteins
(d) Both (a) and (b)

Question. Mutation may result in
(a) change in genotype
(b) change in phenotype
(c) change in metabolism
(d) All of these

Question. The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by
(a) Gregor J Mendel
(b) Alfred Sturtevant
(c) Sutton-Boveri
(d) TH Morgan

Question. What map unit (centi Morgan) is adopted in the construction of genetic maps? 
(a) A unit of distance between two expressed genes representing 100% cross over
(b) A unit of distance between genes on chromosomes, representing 1% cross over
(c) A unit of distance between genes on chromosomes, representing 50% cross over
(d) A unit of distance between two expressed genes representing 10% cross over

Question. Map units on linkage map cannot be relied upon to calculate physical distances on a chromosome for which of the following reasons?
(a) The relationship between recombination frequency and map units is different in every individual
(b) Physical distances between genes change during the coures of cell cycle
(c) Linkage map distances are identical between males and females
(d) The frequency of crossing over varies along the length of the chromosome

Question. Linkage group is
(a) linearly arranged group of linked gene
(b) non-linearly arranged group of linked gene
(c) non-linearly arranged group of unlinked gene
(d) non-linearly arranged group of single gene

Question. Linkage groups are always present on the
(a) homologous chromosomes
(b) analogous chromosomes
(c) sex chromosomes
(d) heterologous chromosomes

Question. Genetic maps can be used in human genome project
(a) starting point in the sequencing of whole genome
(b) measure the distance between genes
(c) map the position of genes on chromosomes
(d) All of the above

Question. Experimental evidences of chromosomal theory of inheritance was given by
(a) S Boveri
(b) TH Morgan
(c) de Vries
(d) W Sutton

Question. Morgan’s experimental organism was
(a) Drosophila melanogaster
(b) Mangifera indica
(c) Mirabilis jalapa
(d) Drosophila indica
Answer : A

Question. Strength of the linkage between the two genes is
(a) proportionate to the distance between them
(b) inversely proportionate to the distance between them
(c) depend on the chromosomes
(d) depend upon the size of chromosomes

Question. In Morgan’s experiment, white and yellow genes were linked tightly, while white and miniature wing were loosely linked. The per cent recombination shown by these genes were
(a) 50% each
(b) 72% and 8.3%, respectively
(c) 0.3% and 53%, respectively
(d) 1.3% and 37.2%, respectively

III. Matching Type Questions

Question. Match the following columns. (Image 193)

Question. Match the following columns. (Image 194)

Question. Match the following columns. (Image 195)

Question. Match the following columns. (Image 196)

Question. Match the following columns.  (Image 197)

Question. Match the terms in Column I with their description in Column II and choose the correct option. (Image 198)

Question. Match the following columns. (Image 199)
Answer : A