Free X-linked Recessive Inheritance MCQs with Answers
45 X-linked Recessive 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.
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
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45 questions · page 2 of 3
- A. Mother: Carrier, Father: Normal
- B. Mother: Colour blind, Father: Carrier
- C. Mother: Normal, Father: Carrier
- D. Mother: Normal, Father: Color blind
Explanation: Since color blindness is an X-linked recessive disease so if the the mother is color blind and the father is normal only then the son…
Correct answer: Mother: Normal, Father: Color blind- A. Y-linked recessive
- B. Sex influenced
- C. Sex limited
- D. Sex linked recessive
Explanation: Hemophilia is more common in males because the gene responsible for hemophilia is located on the X chromosome, making it a sex-linked…
Correct answer: Sex linked recessive- A. Saad, Ahmed, and Ali
- B. Ahmed, Ali, Alia, and Ayesha
- C. Saad and Sara
- D. Alia and Ayesha
- E. Ahmed and Ali
Explanation: Hemophilia is an X-linked recessive disorder, meaning that males (XY) need only one affected X chromosome to express the disorder, while…
Correct answer: Alia and Ayesha- A. It is a sex-linked trait
- B. Occurs due to hormonal differences between sexes
- C. Heterozygous male is normal
- D. Homozygous female is normal
Explanation: Pattern baldness, also known as androgenic alopecia, is influenced by hormonal differences, specifically the effects of androgens (male…
Correct answer: Occurs due to hormonal differences between sexes- A. All her children
- B. All her daughters
- C. Half of her sons
- D. None of these options
Explanation: Haemophilic female = XH Xh Normal male= XH Y Referring to the Punnett square, Half of daughters are affected as a carrier of haemophilia…
Correct answer: Half of her sons- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: Haemophilia is a sex-linked recessive disorder, usually an inherited bleeding disorder in which the blood does not clot properly.
Correct answer: 50%- A. Haemophilia
- B. Colour blidness
- C. Hypophosphatemic ricket
- D. TFM syndrome
Explanation: Hypophosphatemic rickets is an X-linked dominant trait in which excessive loss of phosphate in the urine leads to poorly formed bones…
Correct answer: Hypophosphatemic ricket- A. 1.0
- B. 0.75
- C. 0.50
- D. 0.25
Explanation: Males have 1 X chromosome and 1 Y chromosome, and females have 2 X chromosomes.
Correct answer: 0.50- A. Homozygous
- B. Hemizygous
- C. Heterozygous
- D. Incomplete dominance
Explanation: Hemizygous means having only a single copy of a gene instead of the customary two copies.
Correct answer: Hemizygous- A. False: Females can't have haemophilia
- B. False: Haemophilia wasn't diagnosed until then
- C. True: Females can have haemophilia if both the mother and father were affected
- D. True: Females can have haemophilia if any of the parent were affected
- E. None of the answers are correct
Explanation: Explanation for this question will be added soon.
Correct answer: True: Females can have haemophilia if both the mother and father were affected- A. 0%
- B. 25%
- C. 50%
- D. 100%
Explanation: X chromosome comes from the female and X or Y comes from the man. if the man is normal then the disease will not express in the daughter.
Correct answer: 0%- A. Autosomal
- B. X-linked
- C. Y-linked
- D. X-Y linked
Explanation: Y-linked traits are passed from father to son through the Y chromosome.
Correct answer: Y-linked- A. Heterogametic
- B. Dieogametic
- C. Homogametic
- D. Both B and C
Explanation: Moths and butterflies, have a female heterogametic sex chromosome system, with most females having a ZW constitution while males are ZZ.
Correct answer: Homogametic- A. X-linked
- B. Autosomal
- C. Y-linked
- D. X and Y-linked
Explanation: [A] X-linked traits are not only transmitted from father to son but can be also transmitted to her daughter[B] Autosomal disease can be…
Correct answer: Y-linked- A. XY
- B. SRY
- C. SYX
- D. SXX
Explanation: Y chromosome has an SRY gene. It is the sex determining region Y gene. It is Y linked gene because it is found only on the Y chromosome.
Correct answer: SRY- A. Y-chromosome
- B. X-chromosome
- C. Autosome 7
- D. Autosome 9
Explanation: Red- Green Color blindness is a sex-linked recessive disease which is passed down through the X chromosomes.
Correct answer: X-chromosome- A. 0%
- B. 50%
- C. 75%
- D. 100%
Explanation: If the father is hemophilic (has the disease) and the mother is a carrier, the chances of the baby inheriting the disease will be 50%.
Correct answer: 50%- A. 0%
- B. 50%
- C. 75%
- D. 100%
Explanation: If the father has hemophilia and the mother is a carrier, there is a 50% chance that the baby will inherit the disease.
Correct answer: 50%- A. X - chromosome
- B. XX - chromosomes
- C. YY - chromosomes
- D. XY - chromosomes
Explanation: The correct answer is that a single ovum of a human being contains an X chromosome.
Correct answer: X - chromosome- A. Male
- B. Female
- C. Both male and female
- D. None of them
Explanation: Color blindness is an X-linked recessive trait, meaning it is carried on the X chromosome.
Correct answer: Female