Moderate 946 likes

Question

Judge with the reason the probability of what percentage of the children born to a colour-blind father and a completely normal mother would be colour-blind.

WBBSE Class X Life Science 03 (b) Some Common Genetic Diseases 02 Mark 2023

Answer

The probability of a child being colour-blind if the father is colour-blind and the mother is normal is 50%. This is because the father will pass on his colour-blind gene to all of his children, regardless of the mother’s genotype. The mother, on the other hand, will only pass on her normal gene to half of her children.

Related Questions

More WBBSE Moderate level questions

1/12
Moderate
817
Q. What is the importance of genetic counselling in arranging a marriage?
A. Genetic counselling provides information and advice about the risk of genetic disorders...
Moderate
535
Q. Write one feature of the gene responsible for colour blindness.
A. The gene responsible for colour blindness is X-linked recessive. Explanation: Colour blindness...
Moderate
Q. If an apparently normal female marries a normal male and if two sons are born...
A. Haemophilia is an X‑linked recessive disease; an “apparently normal” mother may be...
Moderate
926
Q. Genetic Counselling helps to ascertain the presence of ____ gene of Thalassaemia disease.
A. Genetic Counselling helps to ascertain the presence of beta-globin gene of Thalassaemia...
Moderate
839
Q. If a female, looking apparently normal but being carrier of haemophilia, marries a normal male...
A. (d) 50% haemophilic son, and 50% apparently normal but carrier daughter. Explanation:...
Moderate
853
Q. Match the words in column-A with the most appropriate words in column B and re-write...
A. Column-A Column-B 1. Diabetes insipidus (d) Hyposecretion of ADH 2. Schwann cell...
Moderate
855
Q. Decide which of the following diseases can be prevented by taking suggestions from pre-marital genetic...
A. (c) Thalassaemia Explanation Thalassaemia is a genetic blood disorder that can be...
Moderate
Q. Black-smooth hair is produced in F₂ generation resulting from a cross between pure black-rough haired...
A. Genetic counselling detects carrier status in parents for autosomal recessive diseases like...
Moderate
Q. Mention the dominant and recessive traits of two characters related with seed and one character...
A. Here are two seed-related characters commonly used in Mendel’s experiments, showing their...
Moderate
Q. What might be the genotype of the mother carrying the gene for colour blindness?
A. XCXc Explanation: Colour blindness is an X-linked recessive trait; a carrier woman...
Moderate
Q. Matching (any five) 1×5=5 Column–A 2.13. ADH 2.14. Amitosis 2.15. Thalassaemia 2.16. Analogous organ 2.17....
A. 2.13 – (e) 2.14 – (d) 2.15 – (g) 2.16 – (b)...
Easy
625
Q. With the help of a checkerboard show the phenotypic ratio of offsprings produced inF2 generation...
A. YR Yr yR yr YR YYRR (Yellow round) YYRr (Yellow round) YyRR...