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What role do alleles play in natural selection?
Genes are the medium by which inherited traits are passed on to offspring. It is inherited traits, and thus genes, that receive positive or negative selection.
Does Natural Selection occur in Genes or Alleles?
Natural selection doesn't directly occur in the genes or alleles. Natural selection occurs in the "real world", in which the organisms with the desirable traits are living, while the organisms with undesireable traits are dying or otherwise failing to reproduce. Nature is "selecting" these animals with useful traits, which survive to reproduce and pass on these genes. The genes are what give animals the certain traits they need in order to survive. The individual alleles give the variation within a certain trait. For example, within the gene for fur color, there can be an allele for white, and an an allele for brown. The bunny that gets the brown allele will probably suvive in the wild. (Unless the environment is snow!)
Alternative versions of genes are called?
alternative forms of a gene are called as alleles..
Natural selection can only act on traits?
Yes, traits that are phenotypical in nature and confer some survival and reproductive advantage, then the alleles that gave rise to these traits become more frequent in the populations gene pool and evolution takes place. So, natural selection is acting on genes in the individuals and population are evolving from this process.
Do some traits require more than one gene to be fully expressed?
Yes. There are some traits like skin color that are controlled by multiple genes within an individual. There is also a problem called nondisjunction that causes a gamete to wind up with two chromosomes instead of one. The offspring then has three chromosomes and three genes for each trait carried on that chromosome. (Nondisjunction of the 21st chromosome causes Down Syndrome, so someone with Down Syndrome has three genes for each trait on the 21st chromosome.)
What are traits of alleles are controlled by?
genes
How are multiple alleles different from polygenic traits?
Multiple alleles are genes that have more than two alleles. An example of this would be blood types, with ABO as three separate alleles.Polygenic traits are traits whose phenotype rely on alleles from different genes. An example of this would be hair type, which relies on genes from different parts of chromosomes.The main difference is that multiple alleles are genes with 3 or more alleles; polygenic traits do not necessarily have more alleles, but they rely on on multiple genes.
What three ways are human traits controlled?
Human traits are controlled by a combination of genetic factors (inherited from parents), environmental factors (such as diet and lifestyle), and epigenetic factors (changes in gene expression without changes in the underlying DNA sequence). These factors interact in complex ways to influence the development and expression of human traits.
Two ways multiple alleles and polygenic traits differ?
Multiple alleles are "the existence of more than two alleles (versions of the gene) for a genetic traits. Polygenic traits are "[characteristics of organisms that are] influenced by several genes." So multiple alleles are more than two alleles for one trait, and polygenic traits are one trait that is influenced by multiple genes. This information came from my biology textbook, "Biology: Principles and Explorations" by Holt, Rinehart, and Winston.
How are traits controlled by two alleles multiple alleles and multiple genes similar and different?
Each have a different genetic code that gives instruction to the brain and other cell bodies.
What are the multiple forms of genes called?
Alleles are genes that exist in multiple forms.
How is the inheritance of traits controlled in organisms?
Inheritance of traits in organisms is controlled by genes, which are segments of DNA that code for specific traits. These genes are passed from parents to offspring through sexual reproduction. The combination of genes from both parents determines the traits that are expressed in the offspring.
Tell you about polygenic inheritance under genetics?
Polygenic inheritance refers to traits that are influenced by multiple genes, each contributing in a cumulative manner to the phenotype. These traits typically exhibit a continuous range of variation rather than distinct categories. Examples include human height and skin color, which are controlled by the interaction of multiple genes. Polygenic traits are also influenced by environmental factors.
What is one difference between a single gene trait and a polygenic trait?
Multiple alleles are "the existence of more than two alleles (versions of the gene) for a genetic traits. Polygenic traits are "[characteristics of organisms that are] influenced by several genes." So multiple alleles are more than two alleles for one trait, and polygenic traits are one trait that is influenced by mulitple genes. This information came from my biology textbook, "Biology: Principles and Explorations" by Holt, Rinehart, and Winston.
What is the difference between alleles and multiple alleles?
Alleles refer to different versions of the same gene. So a single gene can have multiple alleles. For example in fruit flies there is a single gene that controls eye color, and the eye color of the fly depends on the alleles they have for that gene (since they have two copies of every gene, being diploid). A polygenic trait refers to any inheritable trait that is controlled by multiple genes, and each of these genes can have multiple alleles. For example, eye color in humans is a polygenic trait. There are at least three different genes, each with multiple alleles, that determine eye color in humans. Polygenic traits don't follow patterns of mendelian inheritance. So in summation the difference is multiple alleles refers to different versions of one gene and polygenic traits refers to a single trait which is controlled by multiple genes (each with multiple alleles) Yes, or: Multiple alleles are "the existence of more than two alleles (versions of the gene) for a genetic traits. Polygenic traits are "[characteristics of organisms that are] influenced by several genes." So multiple alleles are more than two alleles for one trait, and polygenic traits are one trait that is influenced by multiple genes. This information came from my biology textbook, "Biology: Principles and Explorations" by Holt, Rinehart, and Winston.
What controls traits and inheritance?
On my Science homework was the question What controls Inherited Traits? After reading through my text book I discovered that Inherited traits are controlled by genes. So, the answer to the questtion is genes!
Explain how the inheritance of traits is controlled in organisms Use the term genes and alleles in you explanation?
The most dominant traits are the ones that control organisms genes.
