owing in styles after controlled hand-pollinations in which the two species served as pollen donor (A is blue, B is red) or pollen recipient (A on the left, B on the right). The number of pollen tubes growing in styles of species A was significantly greater than the number growing in styles of species B. However, there was no significant difference in the number of pollen tubes observed in either species based on the identity of the pollen donor. Similarly, there was no significant difference between species in the effect of pollen donor identity on the number of pollen tubes observed (i.e., no significant pollen recipient x pollen donor interaction). Do these data support the hypothesis that the two species maintain their boundaries via a difference in pollen tube growth? Why or why not? 35 30 10 Species A (pollen door Species (pollen donor Species (pollen recipient) 8
Evolutionary Genetics
Evolution is known as continuous changes that occur to adjust organisms in their changing environment over many generations. Various theories have been proposed to illustrate the origin of life and organic evolution. The most accepted one is the theory of natural selection by Charles Darwin. According to his postulate, organisms undergo a struggle for existence due to overproduction. To survive in nature, they acquire variations. The inheritable variations are selected by nature, and it leads to the survival of the fittest.
Phenotype Frequency
The majority of populations have a certain degree of variation in their genetic pools. Scientists can predict the genetic variation happening over time by measuring the amount of genetic variation in a population and these predictions assist them in gaining important insights into the processes that allow organisms to adapt to the environment or to develop into new species over generations. This process is referred to as the process of evolution.
Hardy Weinberg Equilibrium
The frequencies of allele and genotype were maintained constant from one generation to another due to the absence of other evolutionary forces. It is otherwise called the Hardy Weinberg principle the field of population genetics.
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