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Q.7. A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive ? Why or why not ?
Q.8. (a). Why does the sky appear dark instead of blue to an astronaut ?
(b) What happens to image distance in human eye when an object moves away from the eye ?

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The study shows that light colored eye is a dominant trait because this trait appears frequently in every generation. Dominant trait means trait that has a capability to overcome the effect of recessive trait when both are present. According to the study light eye colored parents has light eye colored children which shows that this trait overcomes the other trait (which has to be recessive), that makes it dominant.

a) The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight is not scattered, no scattered light reach the eyes of the astronauts and the sky appears black to them.

b) The image distance is remains the same as the retina of the eye is fixed at a constant position and only the focal length of the crystalline eye lens changes due to its power of accommodation.

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