Read and download free pdf of CBSE Class 12 Biology Sexual Principles of Inheritance And Variation Worksheet. Download printable Biology Class 12 Worksheets in pdf format, CBSE Class 12 Biology Chapter 5 Principles of Inheritance and Variation Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Biology Class 12 Assignments and practice them daily to get better marks in tests and exams for Class 12. Free chapter wise worksheets with answers have been designed by Class 12 teachers as per latest examination pattern
Chapter 5 Principles of Inheritance and Variation Biology Worksheet for Class 12
Class 12 Biology students should refer to the following printable worksheet in Pdf in Class 12. This test paper with questions and solutions for Class 12 Biology will be very useful for tests and exams and help you to score better marks
Class 12 Biology Chapter 5 Principles of Inheritance and Variation Worksheet Pdf
MULTIPLE CHOICE QUESTIONS
Question. Pure line breed refers to
(a) homozygosity
(b) heterozygosity
(c) linkage
(d) both b & c
Answer. A
Question.Given below is a pedigree chart of a family with five children. It shows the inheritance of attached earlobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals. Which one of the following conclusions drawn is correct?
(a) The parents are homozygous recessive.
(b) The trait is Y-linked.
(c) The parents are homozygous dominant.
(d) The parents are heterozygous.
Answer. D
Question. If a homozygous red flowered plant is crossed with a homozygous white flowered plant, the offsprings would be [2002]
(a) all red flowered
(b) half red flowered
(c) half white flowered
(d) all white flowered
Answer. A
Question. Which disease has XXY chromosome constitution?
(a) Down’s syndrome
(b) Turner’s syndrome
(c) Klinefelter’s syndrome
(d) Okazaki syndrome
Answer. C
Question. Barr-body in mammals represents
(a) One of the two X chromosomes in somatic cells of females.
(b) All heterochromatin of male & female cells.
(c) Y chromosomes of male.
(d) All heterochromatin of female cells
Answer. A
Question. Genes of which one of the following is present exclusively on the X-chromosome in humans?
(a) Baldness
(b) Red-green colour blindness
(c) Facial hair/moustaches in males
(d) Night blindness
Answer. B
Question. XO chromosomal abnormality in humans causes
(a) Turner’s syndrome
(b) Down’s syndrome
(c) Patau’s syndrome
(d) Klinefelter’s syndrome
Answer. A
Question. Mirabilis jalapa shows
(a) codominance
(b) incomplete dominance
(c) dominance
(d) complementary genes
Answer. B
Question. The formation of multivalents at meiosis in diploid organism is due to
(a) monosomy
(b) deletion
(c) inversion
(d) reciprocal translocation
Answer. D
Question. In India, we find mangoes with different flavours, colours, fibre content, sugar content and even shelf-life. The large variation is on account of
(a) species diversity
(b) induced mutations
(c) genetic diversity
(d) hybridization
Answer. C
Question. Which one of the following pairs of features is a good example of polygenic inheritance?
(a) Human height and skin colour.
(b) ABO blood group in humans and flower colour of Mirabilis jalapa.
(c) Hair pigment of mouse and tonque rolling in humans.
(d) Human eye colour and sickle cell anaemia.
Answer. A
Question. Gene which suppresses other gene’s activity but does not lie on the same locus is called as
(a) epistatic
(b) supplementary
(c) hypostatic
(d) codominant
Answer. A
Question. Polygenic genes show
(a) similar genotype
(b) different phenotype
(c) different karyotype
(d) different genotype
Answer. B
Question. In Huntington’s disease, the unaffected persons are homozygous for normal allele h. The following is erroneous because
B-142 Topicwise AIIMS Solved Papers – BIOLOGY
(a) it shows both male and female affected by Huntingtons disease
(b) either person 6 or 7 should have the disease, if individual 11 shows the disease.
(c) at least one of the 2 children (8, 9) should have the disease
(d) all of these
Answer. B
Question. Discontinuous variations are
(a) essential features
(b) acquired characters
(c) non-essential changes
(d) mutations
Answer. D
Question. Bird females have chromosome arrangement as
(a) XY
(b) XO
(c) WZ
(d) WW
Answer. C
Question. Gene pool is referred to
(a) the genetic drift caused in a population
(b) aggregate of all genes and their alleles in a population.
(c) deletion of non essential genes.
(d) induce cell division
Answer. B
Question. Given below is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes a and b could be of
(a) colour blindness and body height
(b) attached ear lobe and Rhesus blood group
(c) haemophilia and red-green colour blindness
(d) phenylketonuria and haemophilia
Answer. C
ASSERTION REASON QUESTIONS
Directions : These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following five responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.
Question. Assertion : The genetic complement of an organism is called genotype.
Reason : Genotype is the type of hereditary properties of an organism.
Answer. A
Question. Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme.
Reason : It results in the presence of phenylalanine acid in urine.
Answer. B
Question. Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.
Answer. C
Question. Assertion : Haemophilia is a recessive sex linked disease.
Reason : Haemophilia occurs due to mutation of a structural gene on chromosome 15
Answer. C
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CBSE Class 12 Biology Chapter 5 Principles of Inheritance and Variation Worksheet
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