Genetics and Evolutionary Biology

Sibling species are morphologically similar or identical species that are reproductively isolated. They form through genetic divergence where mutations accumulate over time, eventually creating reproductive barriers even though the species appear similar. This process occurs through gradual genetic changes rather than other mechanisms like genetic drift or artificial selection.

Genetic drift is a random change in allele frequencies that has its most pronounced effects in small populations where chance events can significantly alter the genetic composition from one generation to the next. In large populations, random fluctuations tend to average out, but in small populations, drift can lead to fixation or loss of alleles regardless of their selective advantage.

Genetic drift causes random changes in allele frequencies from one generation to the next. These changes affect the gene pool of the offspring generation (next generation) as alleles are randomly sampled from the parental gene pool. Over multiple generations, drift can lead to fixation or loss of alleles, particularly in small populations where sampling error is most pronounced.

Yes, it occurs due to change in gene frequency due to accumulation of a particular trait.

Species which have two or more sub species are polytypic.

Genetics is the branch of biology that studies heredity (how traits are passed from parents to offspring) and variation (differences among organisms). It examines genes, DNA, and how genetic information is transmitted and expressed. Other options refer to morphology, cytology, and developmental biology - not genetics specifically.

Epistasis has a large influence on the shape of evolutionary landscapes, which leads to profound consequences for evolution and evolvability of traits.

A back mutation or reversion is a point mutation that restores the original sequence and hence the original phenotype.

Some people can curl up the sides of their tongue to form a tube shape. Tongue rolling is controlled by a single gene. However, people can learn to roll their tongue as they get older, suggesting that environmental factors also influence the trait.

Natural selection acts on the phenotype or the observable characteristics of an organism, but the genetic (heritable) basis of any phenotype that gives a reproductive advantage may become more common in a population.

The gene pool is the set of all genes, or genetic information, in any population, usually of a particular species. This also proves to be the basic level at which evolution occurs.

In-situ conservation is on-site conservation or the conservation of genetic resources in natural populations of plant or animal species, such as forest genetic resources in natural populations of tree species.

Hybridization is the mating of genetically different lines to combine desirable traits from both parents. Inbreeding is mating of closely related individuals, selection is choosing preferred traits, and outbreeding is mating of unrelated individuals (but not necessarily distinct lines). Hybridization specifically targets combining different genetic lines.

Industrial melanism is due to natural selection.

Hardy Weinberg Principle says that in a small, randomly mating population, the allele frequencies remain constant from generation to generation.