Free Inheritance MCQs with Answers
1,238 Inheritance MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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- A. Hemophilia - A
- B. Hemophilia - C
- C. Hemophilia - B
- D. Hemophilia - A and B
Explanation: Hemophilia A and hemophilia B are inherited in an X-linked recessive pattern .
Correct answer: Hemophilia - A and B- A. Hemophilia - A
- B. Hemophilia - C
- C. Hemophilia - B
- D. Hemophilia - A and B
Explanation: All X-linked recessive traits exhibit zigzag inheritance.An affected male will transfer his single X chromosome (Xh) to his daughter and…
Correct answer: Hemophilia - A and B- A. Father to son
- B. Maternal grandfather to grandson
- C. Father to daughter
- D. Paternal grandfather to grandson
Explanation: Hemophilia A and B are X linked recessive traits and their genes are located on X-chromosome.
Correct answer: Maternal grandfather to grandson- A. Son
- B. Son's son
- C. Daughter
- D. Daughter's son
Explanation: A father always contribute Y-chromosome to son and X-chromosome to daughter.
Correct answer: Daughter- A. Father's father
- B. Mother's father
- C. Grandfather's father
- D. Grandmother's father
Explanation: Xh is inherited by a male directly from his affected or carrier mother. However, the mother have inherited it from her father or mother.
Correct answer: Mother's father- A. Hemizygous daughter
- B. Homozygous son
- C. Hemizygous son
- D. Heterozygous son
Explanation: In sex-linked (X-linked) traits males cannot be homozygous because the genes for such traits are located on X-chromosomes and males have…
Correct answer: Hemizygous son- A. Maternal grandmother or paternal grandmother
- B. Maternal grandfather or maternal grandmother
- C. Paternal grandmother or paternal grandfather
- D. Paternal grandfather, maternal grandfather
Explanation: Xh is inherited by a male directly from his affected or carrier mother. However, the mother has inherited it from her father or mother.
Correct answer: Maternal grandfather or maternal grandmother- A. Prince Nicholas
- B. Leopold
- C. Rupert
- D. Charles
Explanation: See pedigree of British Royal family given at page 194 of textbook of biology book part II
Correct answer: Leopold- A. II
- B. III
- C. IV
- D. II, III and IV all
Explanation: Except generation-I, all the rest of the generations shown in figure 22.28 of Textbook of biology have hemophiliac sons.
Correct answer: II, III and IV all- A. A
- B. B
- C. C
- D. D
Explanation: A circle with dot in centre indicates carrier daughter.
Correct answer: D- A. Orange, green and blue
- B. Red, green and blue
- C. Red, green and yellow
- D. Red, green and purple
Explanation: The three primary colors associated with normal trichromatic vision are red, green, and blue.
Correct answer: Red, green and blue- A. One
- B. Two
- C. Three
- D. Four
Explanation: There are three types of opsins in the cone cells of our eyes which are associated with normal trichromatic vision.
Correct answer: Three- A. Protanopia
- B. Deuteranopia
- C. Tritanopia
- D. Protanomaly
Explanation: Blue blindness is called tritanopia. It is a rare form of color blindness that is caused by a mutation in the gene that codes for the blue…
Correct answer: Tritanopia- A. X - linked recessive trait
- B. Autosomal trait
- C. X - linked dominant trait
- D. Y - linked trait
Explanation: Yes, blue cone monochromacy (BCM) is an X-linked recessive trait. This means that the gene for BCM is located on the X chromosome, and…
Correct answer: X - linked recessive trait- A. Red blind
- B. Green blind
- C. Blue blind
- D. Red and Green blind
Explanation: Blue blindness is called tritanopia. It is a rare form of color blindness that is caused by a mutation in the gene that codes for the blue…
Correct answer: Red and Green blind- A. Blue blindness
- B. Green blindness
- C. Red blindness
- D. Red and Green blindness
Explanation: Blue color blindness is not inherited in an X-linked manner. It is instead inherited in an autosomal recessive manner, which means that…
Correct answer: Blue blindness- A. 100%
- B. 33%
- C. 25%
- D. 50%
Explanation: The proportion of children with normal color vision is 50%. Color blindness is an X-linked recessive trait, which means that it is carried…
Correct answer: 50%- A. A recessive gene on X-chromosome
- B. A recessive gene on Y-chromosome
- C. A dominant gene on X-chromosome
- D. A dominant gene on Y-chromosome
Explanation: The cause of testicular feminization syndrome (TFS) is a mutation in the androgen receptor gene.
Correct answer: A recessive gene on X-chromosome- A. Female genitalia
- B. No breast
- C. Blind vagina
- D. Degenerated testes
Explanation: A person suffering from testicular feminization syndrome have breasts like a female.
Correct answer: No breast- A. Down's syndrome
- B. Turner's syndrome
- C. Testicular feminization syndrome
- D. Klinefelter's syndrome
Explanation: Persons suffering from testicular feminization syndrome physically look female.
Correct answer: Testicular feminization syndrome