Evolution

Studies have shown that considerable genetic variation exist in the number of abdominal bristles found in fruit fly populations. An experiment on artificial selection on a population of Drosophila melanogaster was…

The table depicts list of characters (I-V) in five species (M-Q) where 1 represents presence and 0 represents absence of the character. Species M Species N Species O Species P Species Q Character I 0 0 0 1 0 Character…

The following graphs depict three different scenarios where the average body size of a population (assuming a normal distribution with a single mean) of a study organism has been plotted over several generations. If…

UPGMA is a method of constructing phylogenetic trees using distance matrices between organisms. The following matrix depicts distance (measured as the difference in characters) between five organisms. The distance…

A cladogram representing the evolution of some animals ($P, Q, R$ and $S$) is shown. I to IV in the cladogram represent different features that have evolved. The correct statement with respect to the given cladogram is

On an island, black-bellied seed cracker birds feed primarily on seeds of two species of sedge plant. These seeds are similar in size but differ dramatically in their hardness. The distribution of bill size (as measured…

In an experiment, a scientist captured and cut the tails of wild male swallow birds that had already set up territories. He then glued tail-feathers back on these birds to get three groups of birds with differing tail…

A tree depicting the evolutionary relationships between a few animals is given below. The correct statement regarding the characters $1-5$ is:

Approximately 400 million years ago, closely related fish species $\mathbf{Q}$ got separated from species $\mathbf{P}$ by continental drift. Species $\mathbf{Q}$ got confined in a small region where environmental…

Cladograms are branched diagrams representing evolutionary relationships. A cladogram with representative animals is shown below. The traits M, N, O and P would represent:

In a population of $1000$ moths, $450$ moths were brown-colored with homozygous genotype and $350$ albino moths that were homozygous for the recessive allele. Assuming random mating within the population, the frequency…

A particular herbivore species $\mathbf{X}$ was being studied. There are two populations of this species, one found in Sri Lanka and the other in Indian mainland. Five thousand years ago, species $\mathbf{X}$ had a…