How can negative traits that don't show up until old age continue in populations? (Why aren't they eliminated through natural selection?) As part of answer, provide an example.
Gene Flow
Gene flow, also known as gene migration, is the introduction of genetic material from a particular population to another population of the same species through interbreeding. For example, a bee facilitates its reproductive process by carrying pollen from one flower to another. The flow alters the composition of the gene pool of the receiving population. It introduces new alleles within the population and helps increase variability. This exchange of genetic material occurs through reproduction and brings about new combinations of traits into the population. Where human beings are concerned, actual migration of populations, whether voluntary or forced, brings about gene flow.
Population Biology
Population biology is the study of patterns in organism populations, specifically the growth and management of population size, population genetics, the evolution of life history, species interactions, and demography.
Speciation
The process of speciation involves the formation of new species during evolution. The new species evolve in such a way that both new and old species are not able to interbreed. Thus, speciation occurs when few members of one species get separated from the main species due to geographical, mechanical, or reproductive isolation. These separated members develop new traits that make them different from the main species. In other words, speciation could be defined as the absence of gene flow between two populations that become new species.
Allele Fixation
A gene is a unit of heredity and contains both physical and functional information that shapes an individual. Genes are made up of DNA (deoxyribonucleic acid), which carry genetic information from one generation to another, from one set of parents to their offspring, and so on. Every cell in a human body, or any living organism, has the same DNA, which implies that every cell in an individual’s body has all the information it needs to build and sustain the body!
#21
Answer the following questions about evolution. Number responses according to the questions (1-4).
- How can negative traits that don't show up until old age continue in populations? (Why aren't they eliminated through natural selection?) As part of answer, provide an example.
- Imagine a population of mice living in a grey, rocky environment. Some mice are grey and some are brown. If natural selection occurs in this population, what would someone expect to see if you returned in 100 mouse generations? Describe what someone see in terms of fur colors in the population.
- Imagine a population of mice living in a grey, rocky environment. Some mice are grey and some are brown. If mutations occur in this population, what could someone see if they returned in 100 mouse generations, that would tell them mutations had occurred? Describe what they would see in terms of fur colors in the population, and how it would be different from what they would see in #2.
- If dark skin helps protect folate and that's so important for fetal development, why didn't all humans evolve to have dark skin? Why did humans living in the north and south evolve lighter skin?
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