One example of a gene becoming more common in a population is antibiotic resistance in bacteria. When the antibiotics kill the bacteria some have a mutation that makes them resistant. These bacteria then reproduce and over time the species genetic code changes so that they are antibiotic resistant. This is the reason new vaccines are constantly released. The same basic principle works in pesticide resistance of rats.
The presence of a dominant allele is not always required to explain common traits in a population. Polygenic inheritance, where multiple genes contribute to a trait, can lead to common traits without a dominant allele. Additionally, environmental factors can also play a significant role in shaping common traits among a population.
No, the allele frequency of a population refers specifically to the proportion of different alleles (variations of a gene) for a particular gene within that population, rather than all genes. It is a measure of genetic variation and is calculated as the number of times an allele appears in a population relative to the total number of alleles for that gene. Therefore, while allele frequencies are influenced by the genes present in a population, they do not encompass all genes.
They exist because all these genes have descended from the genes of common ancestors.
Yes, similar genes are evidence of common ancestry. Genes are passed down from generation to generation, so when organisms share similar genetic sequences, it suggests a shared evolutionary history or common ancestor. This is a fundamental concept in the field of evolutionary biology.
Natural selection is not a thing that acts on populations, it is a tendency for harmful genes to not be passed on (die out) and useful variations to thrive and become common.
They exist because all these genes have descended from the genes of common ancestors.
Darwin's theory outlined natural selection, as one theory within the whole of evolution: those organisms that are better able to survive long enough to reproduce more often, will pass on the genes that result in their offspring surviving longer and reproducing more as well, resulting in that set of genes becoming more common in the population as time passes.
The presence of a dominant allele is not always required to explain common traits in a population. Polygenic inheritance, where multiple genes contribute to a trait, can lead to common traits without a dominant allele. Additionally, environmental factors can also play a significant role in shaping common traits among a population.
Yes. For example if cancer if very common in your family, you likely have genes that are more susceptible to it. That's why people say "its hereditary." It means its caused by your genes. If this is hereditary for you, you are more likely to die from cancer.
Smaller populations are more affected by genetic drift because there are fewer individuals to pass on their genes, leading to a greater chance of random changes in allele frequencies. This can result in certain traits becoming more or less common in the population over time.
They exist because all these genes have descended from the genes of common ancestors.
Balancing and stabilizing selection help maintain genetic diversity in a population by preserving different versions of genes. Balancing selection favors multiple versions of a gene, preventing any one version from becoming too common. Stabilizing selection keeps the average traits in a population stable, allowing for variation to persist. This diversity is important for a population's ability to adapt to changing environments and resist diseases.
Yes, similar genes are evidence of common ancestry. Genes are passed down from generation to generation, so when organisms share similar genetic sequences, it suggests a shared evolutionary history or common ancestor. This is a fundamental concept in the field of evolutionary biology.
Genetic engineering, where genes are manipulated to create new traits in organisms, is a common example of biotechnology. This can be seen in the development of genetically modified crops or bacteria that produce insulin for medical use.
In the zebra population there are variation in the stripes. Genes are responsible for variation in their stripes and there are no two zebras that are alike.
Natural selection is not a thing that acts on populations, it is a tendency for harmful genes to not be passed on (die out) and useful variations to thrive and become common.
The collection of all the genes in a population is called the gene pool. This gene pool contains all of the genetic variation within a population, which can be passed on to future generations through reproduction.