Principles of Inheritance and Variation

When a yellow mouse was crossed to another yellow mouse, the $$F_1$$ generation produces yellow and brown-black mice in the ratio 2 : 1. The yellow mice are never homozygous. The reason is
The effect of today's radioactive fallout will probably be more harmful to children of future generation than to present day children because
A family of five daughters only is expecting sixth issue. The chance of its beings a son is?
Which of the following describe the characteristics of genes?
Mendel formulated the laws of heredity considering seven pairs of constrasting characters in the pea plant. If he had studied an eighth pair, the law which would have been altered is