A colourblind man marries a woman, who is homozygous for normal colour vision, the probability of their son being colour blind is ……………….
- ✓0%
- B25%
- C50%
- D100%
Answer: A.
View full solution →Question types
Inheritance and Variation question types
315 questions across 10 question groups — pick any mix to generate a BIOLOGY paper with step-by-step answer keys.
315
Questions
10
Question groups
5
Question types
01
MCQ
91 Q→02Answer the following questions
89 Q→03Answer the following questions.
16 Q→04Answer the following questions in detail.
34 Q→05Answer the following questions in detail.
42 Q→06Complete the following table.
4 Q→07Diagram based question.
7 Q→08Write the short note.
8 Q→09Answer the following in detail :
17 Q→10Case study (4 Marks)
7 Q→Sample Questions
Inheritance and Variation questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Find the mismatched pair:
- ✓Down’s syndrome = 44 + XY
- BTurner’s syndrome = 44 + XO
- CKlinefelter’s syndrome = 44 + XXY
- DSuper female = 44 + XXX
Answer: A.
View full solution →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 ?
- Ap and q
- Br and s
- Cs and t
- ✓p and s
Answer: D.
View full solution →Chromosomal theory of inheritance was proposed by ……………….
- ✓Sutton and Boveri
- BWatson and Crick
- CMiller and Urey
- DOparin and Halden
Answer: A.
View full solution →If the centromere is situated near the end of the chromosome, the chromosome is called ……………….
- AMetacentric
- BAcrocentric
- CSub-Metacentric
- ✓Telocentric
Answer: D.
View full solution →Give Definitions: Aneuploidy
Give Definitions: Syndrome
Give Definitions: Non-disjunction
Give Definitions: Linkage
Give Definitions: Back cross
Match the column
| 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 |
Give one example of complete sex linkage.
Give an example of chromosomal disorder caused due to non-disjunction of autosomes.
What are holandric traits?
What are X-linked genes?
Write a brief account of Turner’s syndrome.
What are the characteristic symptoms of Down’s syndrome?
What are the causes of Down’s syndrome?
What are the main generalizations given after Mendel’s experiments on the pea plant?
Give Reasons : Human female is referred to as carrier of colour blindness.
Observe the given pedigree chart and answer the following questions
(a) Identify whether the trait is sex-linked or autosomal.
(b) Give an example of a trait in human beings which shows such a pattern of inheritance.
Explain the chromosomal theory of inheritance.
Distinguish between
Compare X-chromosome and Y-chromosome.
Compare X-chromosome and Y-chromosome.
Long Answer Questions: PKU.
Long Answer Questions
What is linkage? How many linkage groups do occur in human being and maize?
What is linkage? How many linkage groups do occur in human being and maize?
Types of traits:
[Sickle-cell anaemia, Widow’s peak, Height in human beings.]
[Sickle-cell anaemia, Widow’s peak, Height in human beings.]
| Column A | Column B |
| (1) Pleiotropy | —————– |
| (2) Polygenes | —————– |
| (3) Autosomal dominance | —————– |
Types of traits:
[Flower colour of Mirabelis jalapa, Coat colour of cattle, Human blood groups]
[Flower colour of Mirabelis jalapa, Coat colour of cattle, Human blood groups]
| Column A | Column B |
| (1) Co-dominance | —————– |
| (2) Incomplete dominance | —————– |
| (3) Multiple allelism | —————– |
Types of sex-linked genes:
[Haemophilia, Ichthyosis, Nephritis, Myopia, Hypertrichosis, Retinitis pigmentosa]
[Haemophilia, Ichthyosis, Nephritis, Myopia, Hypertrichosis, Retinitis pigmentosa]
| Column A | Column B |
| (1) Completely X-linked genes | —————– |
| (2) Completely Y-linked genes | —————– |
| (3) Incompletely sex-linked genes | —————– |
Genetic Disorders
[Turner’s syndrome, Sickle-cell anaemia, Thalassemia, Edward’s syndrome, Klinefelter’s syndrome, Down’s syndrome]
[Turner’s syndrome, Sickle-cell anaemia, Thalassemia, Edward’s syndrome, Klinefelter’s syndrome, Down’s syndrome]
| Column A | Column B |
| (A) Autosomal disorder | —————– |
| (B) Sex chromosomal disorder | —————– |
| (C) Mendelian disorder | —————– |
Give the graphical representation of pleiotropy to show inheritance of Sickle-cell anaemia.
Sketch and label structure of X and Y chromosomes.
Draw the following crosses to show inheritance of haemophilia : Normal female with haemophilic male. Show their progeny. If one of their carrier daughters marries a normal male what would be possible genotypes of this generation.
Draw two crosses to show inheritance of colour blindness, (i) A cross between normal female and colour blind male, (ii) A cross of carrier woman with normal man.
Give a cross of co$-$dominance using a suitable example.
View full solution →Thalassemia
X-body.
Y-linked or Holandric genes.
Environmental sex determination
Widow’s peak.
Mention the types of deviations from Mendel’s finding. ### Describe Neo-Mendelism in short.
Why are farmers and gardeners advised to buy new F1 hybrid seeds every year?
Write the statements of three laws of inheritance given by Mendel.
Thalassemia
X-body.
Distinguish Between: Turner’s syndrome and Klinefelter’s syndrome.
Distinguish Between: Incomplete dominance and Co$-$dominance.
View full solution →Distinguish Between: Phenotype and Genotype.
Distinguish Between: Dominant characters and Recessive characters.
Distinguish Between: Monohybrid cross and Dihybrid cross.
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