Recent studies on Archaea suggest that life could have orginated:
Extra-terrestrially and seeded through meteorite impact.
In shallow coastal area
In deep hydrothermal vents
In, hot terrestrial habitats
Allele frequency of a particular allele was found to be 0.6 in three different populations. It is probably due to is
Neutral allele
Stable polymorphism
Heterozygote advantage
Natural selection
Molecular evolution do not reflects
Species divergence
Convergent evolution
Natural selection
Neutral mutation
In an altruistic act, if a donor sacrifices ‘C’ offspring which helps the recipient to gain ‘B’ offspring and the donor is related to the recipient by a coefficient γ, under which condition would kin selection favour this altruistic trait?
B > C
B > γC
γB- C= 0
λB - C >0
D.
λB - C >0
Kin selection is a subcategory of group selection, where the group is found of releated organisms. Group selection and kin selection are two concepts but one process.
Kin selection would favour the altruistics act = λB-C >0
Following cladogram represents changes in annelids during evolution.
The group ‘C’ in cladogram represents :
Hirudinea
Echiura
Polychaetes
Oligochaeta
Mammalian jaw has evolved from
Pharyngeal arches
Temporal bone
Frontal bone
Dentary and squamosal bones
According to MacArthur and Wilson's equilibrium theory, which of the following is true?
Large island and islands closer to continent are expected to have more species than smaller and isolated islands.
Smaller islands and islands for from the continent are expected to have more species than larger and isolated islands
Smaller islands and islands closer to the continent are expected to have more species than far away smaller and isolated islands
More species are expected on all islands irrespective of their size and distance from the continent.
Primary production in aquatic ecosystem is measured using Light and Dark bottle technique. In this method, as an indirect measure of photosynthetic production, dissolved oxygen concentration of the pond water enclosed in a BOD bottle is measured initially (I) and after a fixed duration of incubation in a light bottle (L) and a dark bottle (D). Then the gross and net primaty pdocuctions are estimated is
(L‐D) and (L‐I), respectively
(L‐I) and (L‐D) respectively
(L‐I) and (I‐D) respectively
(L‐D) and (I‐D) respectively
Identify the most appropriate cladogram that can be constructed using the data matrix given below, assuming ‘o’s are pleisomorphic and ‘1’ are apomorphic characters
1 | 2 | 3 | 4 | 5 | |
A | 0 | 1 | 0 | 0 | 0 |
B | 0 | 1 | 1 | 0 | 0 |
C | 0 | 1 | 0 | 0 | 0 |
D | 0 | 1 | 1 | 0 | 1 |
Gause’s competitive exclusion principle states that two species with identical niches cannot coexist indefinitely. Which of the following statements is the most appropriate regarding the validity of the principle?
It depends on how one defines niche
There are in nature many instances of continued coexistence of closely related species
The principle is universally true
It does not predict the outcome where, both the species are equally strong competitors