Here are the four postulates of natural selection, according to Charles Darwin:
1. variability - refers to different mutations that create different species
2. heritability - refers to the genes that are passed from one organism onto its descendants
3. overproduction of offspring - refers to the fact that more "children" is born than dies
4. natural selection - refers to those organisms that survive because they adapt to their surroundings better than those who will die
Answer:
a) 
b) 
c) 
d) 
e) 
Explanation:
When two heterozygous plants with genotype Bb are crossed, following offspring are produced
Bb * Bb
BB, Bb, Bb, bb
so the probability of blue offspring is
and the probability of white offspring is 
a) Probability of all 4 peas as blue

b) Probability of 3 blue and 1 white

c) Probability of 2 blue and 2 white

d) Probability of 1 blue and 3 white

e) Probability of all white
