An allele that reduces the fitness of organisms is found to decrease very rapidly in a population. Most likely this allele is:
1. recently mutated
2. rare
3. dominant
4. recessive

The persistence of different genotypes in a population through heterozygote superiority is an example of:

The set of all genes, or genetic information, in a unit of evolution is called the :
1. genotype
2. polymorphism
3. multiple allelism
4. gene pool

Bryophytes evolved from:
1. Chlorophyte ancestors
2. Tracheophyte ancestors
3. Rhynia-type plants
4. Psilophytons

In allopatric speciation, reproductive isolation is initially caused by:

Persons with sickle cell trait are resistant to severe malaria. This shows:
1. heterozygote advantage
2. heterosis
3. punctuated equilibrium
4. reverse evolution

The mammals evolved from:
1. Therapsids
2. Prosimians
3. Platyrrhinis
4. Sauropsids

The most critical evolutionary process, that leads to changes in allele frequencies and favors or promotes adaptation as a product of evolution, is :

The differential success in the reproduction, of an organism, in a given environment, is :

A small population experiences a sudden crash in size due to a natural calamity. The biggest threat to the population is:
1. loss of genetic variability
2. tendency towards assortative mating
3. reduced gene flow
4. Hardy - Weinberg disequilibrium