If a female, looking apparently normal but being carrier of haemophilia, marries a normal male and if two sons and two daughters are born to them, then what would be the probability of manifestation of haemophilia among the children? (a) 100% haemophilic son and 0% haemophilic daughter (b) 50% haemophilic son and 50% haemophilic daughter (c) 0% haemophilic son and 50% haemophilic daughter (d) 50% haemophilic son, and 50% apparently normal but carrier daughter

Write one feature of the gene responsible for colour blindness.

Decide which of the following diseases can be prevented by taking suggestions from pre-marital genetic counselling — (a) Goitre (b) Malaria (c) Thalassaemia (d) Tuberculosis

What is the similarity between the two genes responsible for colour blindness and haemophilia?

What might be the genotype of the mother carrying the gene for colour blindness?

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.

What is the importance of genetic counselling in arranging a marriage?

Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns Column-A Column-B 1. Diabetes insipidus (a) Law of Independent Assortment 2. Schwann cell (b) Brittleness of bone 3. Meiosis (c) Exists between neurolemma and myelin sheath of axon 4. Senescence phase (d) Hyposecretion of ADH 5. Genetic disease (e) Spore mother cell and germ mother cell 6. The second law of Mendel (f) Colour blindness

With the help of a checkerboard show the phenotypic ratio of offsprings produced inF2 generation as a result of a cross between a pea plant having pure round yellow coloured seed and another pea plant having wrinkled green coloured seed. Write Mendel's law of heredity derived from this experiment. [3+2=5] OR Demonstrate a cross for eradication of misconceptions prevailing among human society regarding the process of determination of sex among children. What are the symptoms of thalassaemia? [3+2=5]

What is the role of genetic counselling in the eradication of geneticdisease from the society? Black-smooth hair is produced in F₂ generation resulting from a cross between pure black-rough haired guinea pig (BBRR) and pure white-smooth haired guinea pig (bbrr). Show their possible genotypes and genotypic ratios with the help of a table. [3 + 2]

Mention the dominant and recessive traits of two characters related with seed and one character related with flower of pea plant. Very often it is experienced that a colour-blind son is born to apparently normal parents. Show with the help of a cross how it happens.

If an apparently normal female marries a normal male and if two sons are born to them then show with the help of a cross the probability of haemophilia in the sons.