Sometimes it is observed that both parents are normal. But they have a colour-blind son. Explain how this is possible with the help of a cross.

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

The predominant sound waves used in human speech have wavelengths in the range from 1.0 to 3.0 meters. Using the ideas of diffraction, explain how it is possible to hear a person's voice even when he is facing away from you.

A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind?

Inheritance patterns of flower colour in garden pea plant and snap dragon differ. Why is the difference observed? Explain the difference with the help of crosses in their inheritance patterns.

Ionic solids, which have anioninc vacancies due to metal excess defect, developed colour. Explain with the help of a suitalbe example.

Show with the help of a cross, how colour blindness in inherited.

If husband and wife both are normal in vision but fathers of both were colour blind, the probabilityi of their first daughter to be colour blind is

A normal visioned man whose father was colour blind, marries a woman whose father was also colour blind. They have their first child as a daughter. What are the chances that this child would be colour blind?

A cross between a red flower bearing plant and a white flower bearing plant of Antirrhinum produced all plants having pink flowers. Work out a cross to explain how this is possible.

In humans, red-green colour blindness is recessive and sex-linked, while albinism is recessive and autosomal. A marriage between two homozygous parents a normal visioned albino woman and a colour blind and normally pigmented man will produce children 1. who are all phenotypically normal visioned and have normal pigmentation 2. half of whom are colour-blind and the other half having normal vision and all of them having normal pigmentation 3. all of whom have normal vision, but half of whom are albino and the other half with normal pigmentation. 4. of four categories, normal visioned, pigmented, normal visioned, albino, colour blind, pigmented, colour blind, albino, all in equal proportions