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What id genetic variation?
Genetic Variation is a measure of the genetic differences there are within populations or species. For example, a population with many different alleles at a locus may be said to have a lot of genetic variation at that locus. Genetic variation is essential for natural selection to operate since natural selection can only increase or decrease frequency of alleles already in the population
What is one difference between single gene trait and a polygenic trait?
Polygenic traits result in more variation because so many more alleles are involved in the process of reproduction.
What is the maximum number of different alleles?
The maximum number of different alleles for a single gene is theoretically unlimited. However, in a population, typically only a few common alleles may exist due to genetic variation and mutation rates.
Mendel's Law of segregation as it applies to the distribution of alleles in Gametes?
Mendel's Law of Segregation states that each individual has two alleles for a particular trait, and these alleles separate during gamete formation so that each gamete receives only one allele. This results in the random distribution of alleles into gametes and leads to genetic variation in offspring.
The two alleles for a trait seperate when gametes are formed?
This is known as Mendel's law of segregation, where alleles of a gene separate during the formation of gametes, ensuring that each gamete carries only one allele. This process results in genetic variation in offspring due to the random assortment of alleles.
Do all metamorphic rocks have layers?
No. The layering or foliation only occurs when there is a variation in the composition of the original rock. If the rock is homogeneous, then there will be no foliation.
What would be the consequences for evolution if there were no reproductive variation?
There would be no adaptive change due to natural selection and only genetic drift due to random events and gene flow due to population mixing would occur. Alleles would change, but without reproductive variation speciation could not occur.
Does fertilization create new combinations of alleles?
Yes, fertilization can create new combinations of alleles by bringing together the genetic material from two different parents. This process results in offspring with a unique set of alleles that may not be present in either parent.
Why does the baby have only two alleles if the inheritance of blood type is controlled by three alleles?
Blood type inheritance is determined by three alleles (A, B, O), but an individual inherits only two alleles, one from each parent. This means a baby can have only two alleles for blood type, such as AO or BO, even though three alleles exist in the population.
What process produces new alleles of a gene?
Mutations are the main process that produces new alleles of a gene. Mutations can arise from errors during DNA replication, exposure to environmental factors like radiation or chemicals, or through genetic recombination during meiosis. These new alleles can introduce genetic variation into a population.
What are the alleles of a gene?
That depends on the gene: some genes have only a few alleles, some genes have hundreds or even thousands of alleles.
What is the difference between continuous and discontinuous genetic variation?
Continuous variation is a variation that is distributable; under a normal curve. Height is an example of this with all heights being along a continuum of heights within populations, at least. This distribution of traits is usually controlled by many alleles in a additive fashion. Polygenic. Discontinuous variation is of one trait, allele, or the other. Blood groups are an example of this. A, B , O. You can only have two alleles here, so AA and AB and OO and AO, AB etc. are the expressed ( less the recessive O, except homozygous ) traits. These are single variations based on one allele and are not distributable along a continuum.
