MEDIUM
12th CBSE
IMPORTANT
Earn 100

Why is nascent oxygen supported to be toxic to aerobic life forms?

Important Questions on Evolution

HARD
12th CBSE
IMPORTANT

While creation and presence of variation is direction less, natural selection is directional as it is in the context of adaptation. Comment.

HARD
12th CBSE
IMPORTANT

The evolutionary story of moths in England during industrialisation reveals, that "evolution is apparently reversible". Clarify this statement.

HARD
12th CBSE
IMPORTANT
Comment on the statement that "evolution and natural selection are end result or consequence of some other processes but themselves are not processes".
HARD
12th CBSE
IMPORTANT
State and explain any three factors affecting allele frequency in populations.
HARD
12th CBSE
IMPORTANT

Gene flow occurs through generations. Gene flow can occur across language barriers in humans. If we have a technique of measuring specific allele frequencies in different population of the world, can we not predict human migratory patterns in pre-history and history? Do you agree or disagree? Provide explanation to your answer.

MEDIUM
12th CBSE
IMPORTANT
How do you express the meaning of words like race, breed, cultivars or variety?
MEDIUM
12th CBSE
IMPORTANT

When we say "survival of the fittest", does it mean that
a. Those which are fit only survive, or

b. Those that survive are called fit?

Comment

MEDIUM
12th CBSE
IMPORTANT

Enumerate three most important characteristic criteria for designating a Mendelian population.