Answer:
<u>Allopatric speciation</u> is the gradual emergence of two or more species as a result of the geographic separation of two or more groups of animals of the same species.
Explanation:
Speciation is the gradual process by which populations evolve in different species. It is understood by allopatric speciation, that gradual speciation that occurs due to geographical isolation between biological populations of the same species. During this speciation, a population is divided by some geographical barrier, when populations are physically isolated due to geographical barriers (rivers, mountains, among others), the genetic flow between them is interrupted and over time different races will evolve that will become in different species.
Answer:
D. Sterility Locus
Explanation:
Angiosperms have several mechanisms to prevent self-pollination due to the advantage of cross-pollination. One of such mechanisms is self-incompatibility genes present on the sterility locus.
These genes determine the germination of the pollen on the stigma. If both the pollen and stigma carry the same allele of the gene present at the sterility locus, the germination of pollen is prevented.
The sterility locus has multiple alleles and the presence of the same alleles at the same locus in both pollen and stigma prevents the pollen germination.
For example, pollen from S1S2 individuals can not germinate on the stigma with the S1S3 genotype. Here, the pollen does not obtain water as required for germination from the stigma and are unable to germinate.
<span>Hormones are protein-based substance that are secreted by endocrine glands. They serve as a way to transport information from one part of the body to another in order to regulate.</span>
Boxer believed it was his (their fault) that the slaughter took place. Napoleon is always right and he will work harder. ... He was the strongest animal.
The interactions of the ecosystems are all part of the biosphere. The organisms in the biosphere interact with each of the other abiotic physical systems, namely the hydrosphere, the atmosphere and the lithosphere. These interactions not only shape the nature of the ecosystems, but also affect the geology and geography of the system.
