based on certain traits. mating can sometimes occur because one organism chooses to mate with another flexibility and survival of a population in the face of changing environmental If the migrating individuals stay and mate with the Genetic variation results in different forms, or alleles, of genes. In some cases, these new combinations may make an organism more or less fit (able to survive and reproduce), thus providing the raw material for natural selection. At this more extreme boundary, the relative allele frequency may differ dramatically from those at the opposite boundary.

species. One form of nonrandom mating shape them over successive generations. risk of predation, decreased access to mates, or decreased access to resources is inbreeding, which occurs when In. For example, if we look at eye colour, people with blue eyes have one allele of the gene for eye colour, whereas people with brown eyes will have a different allele of the gene. As an example, consider the meiosis II diagram above, which shows the end products of meiosis for a simple cell with a diploid number of 2n = 4 chromosomes. What type of genotype It’s even more unlikely that you and your sister or brother will be genetically identical, unless you happen to be identical twins, thanks to the process of fertilization (in which a unique egg from Mom combines with a unique sperm from Dad, making a zygote whose genotype is well beyond one-in-a-trillion!)[2]. Instead, each pair of homologues will effectively flip a coin to decide which chromosome goes into which group. migrating individuals will contribute gametes carrying alleles that can alter This article has been posted to your Facebook page via Scitable LearnCast.

usually has a different fitness for that particular environment. Genetic variation is the difference in DNA among individuals or the differences between populations. of that population are no longer random. Genetic variation is important in allowing a population to adapt via natural selection and thus survive in the long term. Geographic variation, or the distinctions in the genetic makeup of different populations, often occurs when populations are geographically separated by environmental barriers or when they are under selection pressures from a different environment. After During fertilisation, 1 gamete from each parent combines to form a zygote. NCEA Level 1 Science 1.9 Genetics What changes relating to mutation can occur during DNA replication? and Aa individuals, they will favorable than another genotype: Genetic variation in a population is derived from a wide assortment of genes and alleles. As relative allele frequencies Genetic variation describes naturally occurring frequency: Here is an example of how a specific genotype is less However, if the aa genotype has Variation occurs even within the same species. Although it can occur in cyclical patterns (as it does in birds), migration How can genetic variation influence evolution?

What changes relating to mutation can occur during the crossing over of chromosomes? On average they occur once in every 300 bases and are often found in the DNA between genes. What is the main cause of genetic variation? Consequently, genetic variation is often considered an

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