MCQ on heredity and variation class 12 NCERT based question CBSE pattern

Test Code: HV                           Paper- I (Zoology)         Test No. 2017-001

Date: 11/09/2017                                                                                             Duration: 30 min

Class: XII                                                                                                        Marks: 25

Note: attempt all question, all question carries equal mark, one mark per question, there will be no negative marking.

11.       Individuals with Down syndrome have ______ copies of chromosome 21

a.        One                  b. two                           c three                          d. four

22.       Which of the followings is a well-known autosomal abnormality at birth?

a.        Klinefelter syndrome                            c. Down syndrome

b.       Patau syndrome                                    d. Turner syndrome

33.       Mendel's principle of segregation means that the germ cells always receive

a.        One pair of alleles                                 c. one of the paired alleles

b.       one quarter of the genes                        d. any pairs of alleles

44.       In blood group typing in human, if an allele contributed by one parent is I^A and an allele contributed by the other parent is i, the resulting blood group of the offspring will be

a.        A                      b. B                              c. AB                            d. O

55.       An individual who has two different alleles of a gene is called _____

a.        Allelopathic     b. homozygous             c. heterozygous             d. codominant

66.       Point mutation involves

a.        Deletion           b. insertion       c. change in single base pair      d. duplication

77.       Rh factor can produce life-threatening disease ______

a.        Erythroblastosis fetalis                          c. AIDS

b.       turner’s syndrome                                 d. sickle cell anaemia

88.       ABO blood groups in humans are controlled by the gene l. It has three alleles – lA, lB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

a.        Two                 b. three                         c. one                           d. four

99.       Which of the following pairs is correctly matched?

a.        Sickle cell anaemia – X chromosome                

b.       Down’s syndrome – 21^st chromosome   

c.        haemophilia – Y chromosome

d.       Parkinson’s disease – X and Y chromosome

110.    ______ are heterozygous with regard to only one pair of alleles

a.        Testcrosses       b. dihybrids                  c. monohybrids             d. none of these

111.    Test cross is a cross between

a.        Hybrid x Hybrid parent                         c. Hybrid x dominant parent

b.       Hybrid x Recessive parent                     d. two distantly related species

112.    Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

a.        Color blindness – Y linked       

b.       Klinefelter’s syndrome – 44 autosomes +XXY

c.        Down syndrome – 44 autosomes + XO

d.       Erythroblastosis fetalis – X linked

113.    When the effects of both alleles are equally expressed in the heterozygote which one of the followings occurs?

a.        Segregation      b. codominance            c. pleiotropy     d. incomplete dominance

114.    A character which is expressed in a hybrid is called

a.        Dominant         b. recessive                  c. co-dominant              d. epistatic

115.    How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

a.        Three               b. four                          c. nine                          d. two

116.    If a colour-blind woman marries a normal versioned man, their sons will be

a.        Three -fourths colour-blind and one- fourth normal

b.       One-half colour-blind and one-half normal

c.        All normal versioned

d.       All colour-blind

117.    A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?

a.        Type A                         b. type B                       c. type AB                    d. type O

118.    Haemophilia is more commonly seen in human males than in human females because

a.        This disease is due to a Y-linked recessive mutation

b.       This disease is due to an X-linked recessive mutation

c.        This disease is due to an X-linked dominant

d.       A greater proportion of girls die in infancy

119.    Phenotype of an organism is the result of

a.        Environmental changes and sexual dimorphism

b.       Cytoplasmic effects and nutrition

c.        Mutations and linkages

d.       Genotype and environment interactions

220.    Sickle cell anaemia is

a.        Characterized by elongated sickle like RBCs with a nucleus

b.       An autosomal linked dominant trait

c.        Caused by substitution of Valine by Glutamic acid in the beta-globin of haemoglobin

d.       Caused by a change in a single base pair of DNA

Total Marks: 20                                                                                  Obtained Marks:

Results:

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