By what is the expression of tallness in the pea plant exhibited?

On which of the following plant species has Mendel worked?

Define evolution. How does it occur? Describe how fossils provide us evidence in support of evolution.

$(a)$ What are monohybrid and dihybrid crosses?
$(b)$ How did Mendel prove that tallness is the dominant trait and dwarfness is the recessive trait in a pea plant? Explain with the help of a monohybrid cross.

An angiosperm plant having red coloured flowers when crossed with another having the same colour produced $40$ progenies,out of which $30$ plants were with red coloured flowers and $10$ plants were with white coloured flowers. Find out:
$(a)$ What is the possible genotype of parent plants?
$(b)$ Which trait is dominant and which is recessive?
$(c)$ What is this cross called and what is its phenotypic ratio?

What are the three ways which can produce variant genotypes in the environment?