Inheritance and Variation class 12 biology chapter 3 exercise solutions

Inheritance and Variation class 12 biology chapter 3 exercise solutions

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class 12 biology chapter 3 inheritance and variation exercise solutions inheritance and variation class 12 exercise solutions principles of inheritance and variation Solutions made easy biology class 12 Inheritance and variation class 12

Q. 1 Multiple choice questions.
1. Phenotypic ratio of incomplete
dominance in Mirabilis jalapa.
a. 2 : 1 : 1 b. 1 : 2 : 1
c. 3 : 1 d. 2 : 2
2. In dihybrid cross, F2
generation offsprings
show four different phenotypes while the
genotypes are ................
a. six b. nine
c. eight d. sixteen
3. A cross between an individual with
unknown genotype for a trait with
recessive plant for that trait is ..............
a. back cross b. reciprocal cross
c. monohybrid cross d. test cross
4. When phenotypic and genotypic ratios
are the same, then it is an example of
............
a. incomplete dominance
b. complete dominance
c. Multiple alleles
d. cytoplasmic inheritance
5. If the centromere is situated near the end
of the chromosome, the chromosome is
called ................
a. Metacentric b. Acrocentric
c. Sub-Metacentric d. Telocentric
6. Chromosomal theory of inheritance was
proposed by ................
a. Sutton and Boveri
b. Watson and Crick
c. Miller and Urey
d. Oparin and Halden
7. If the genes are located in a chromosome
as p-q-r-s-t, which of the following gene
pairs will have least probability of being
inherited together?
a. p and q b. r and s
c. s and t d. p and s
8. Find the mis match pair :-
a. Down’s syndrome = 44 + XY
b. Turner’s syndrome = 44 + XO
c. Klinefelter syndrome = 44 + XXY
d. Super female = 44 + XXX
9. A colourblind man marries a woman,
who is homozygous for normal colour
vision ,the probability of their son being
colourblind is –
a. 0% b. 25%
c. 50% d. 100%
Q. 2 Very Short Answer Questions.
1. Explain the statements :
a. Test cross is back cross but back cross
is not necessarily a test cross.
b. Law of dominance is not universal.
2. Define the following terms :
a. Dihybrid cross b. Homozygous
c. Heterozygous d. Test cross
3. What is allosome?
4. What is crossing over?
5. Give one example of autosomal recessive
disorder.
6. What are X-linked genes?
7. What are holandric traits?
8. Give an example of chromosomal
disorder caused due to non-disjunction
of autosomes.
9. Give one example of complete sex
linkage?
Q. 3 Short Answer Questions.
1. Enlist seven traits of pea plant selected/
studied by Mendel.
2. Why law of segregation is also called the
law of purity of gametes?
3. Write a note on pleiotropy.
4. What are the reasons of Mendel success?
5. “Father is responsible for determination
of sex of child and not the mother”.
Justify.
6. What is linkage? How many linkage
groups do occur in human being?
7. Write note on –PKU
8. Compare - X-chromosome and Y-
chromosome.
9. Explain the chromosomal theory of
inheritance.
significance.
trait in human
beings which shows such a pattern
of inheritance.
Q. 4 Match the column-I with column-II
and re-write the matching pairs.
Column-I Column-II
1. 21 trisomy a. Turner’s syndrome
2. X-monosomy b. Klinefelter’s
syndrome
3. Holandric traits c. Down's syndrome
4. Feminized male d. Hypertrichosis
Project :
Study the genetic traits like Rolling of tongue
or Widow’s peak in your class and write your
own observations.

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