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https://www.youtube.com/watch?v=4aoFCZGr3LY

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Crossing over is a form of variation and occurs in a stage of meiosis. One chromatid of each chromosome homologous pair is swapped with each other. This is a form of variation as it creates different combinations of dominant and recessive alleles.

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A monohybrid cross is a mating between two individuals with different alleles. The character(s) being studied in a monohybrid cross are governed by two or multiple alleles for a single locus.

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A monohybrid cross is a mating between two individuals with different alleles. The character(s) being studied in a monohybrid cross are governed by two or multiple alleles for a single locus.

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A genetic situation in which an allele does not completely take over another, resulting in a new phenotype

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The process by which forms of life having traits that better enable them to adapt to specific environmental pressures, as predators,changes in climate, or competition for food or mates, will tend to survive and reproduce in greater numbers than others of their kind,thus ensuring the perpetuation of those favorable traits in succeeding generations.

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Genes that are on the same chromosome (the closer they are together the closer they are linked) .e.g blue eyes and blonde hair.

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Genes that are on the same chromosome (the closer they are together the closer they are linked) .e.g blue eyes and blonde hair.

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when new alleles are introduced into a population, thus causing a wider gene pool and more variation within the population

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when new alleles are introduced into a population, thus causing a wider gene pool and more variation within the population

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When two separate alleles are close together on a chromosome meaning they are likely to be inherited together.

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When a species genetic pool starts to drift toward one allele type due to natural causes.  One allele type becomes "fixed" and the other becomes "lost"

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When a species genetic pool starts to drift toward one allele type due to natural causes.  One allele type becomes "fixed" and the other becomes "lost"

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Of the two pink monkeys in the world – one male, one female – the female dies, ensuring that there will never be a pure-bred pink monkey again.

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Some alleles are lethal when present in two copies 

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Some alleles are lethal when present in two copies 

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the changing of the structure of a gene, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes

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the changing of the structure of a gene, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes

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The allele for white fur in wild rabbits causes them to be targeted by predators, therefore they are selected against and eaten

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The allele for white fur in wild rabbits causes them to be targeted by predators, therefore they are selected against and eaten

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When 2 genes are linked together. e.g most people  say that if someone has ginger hair they must have freckles too

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Lethal alleles may be completely dominant, incompletely dominant, or recessive.

Manx cats!!!!
The manx allele is incompletely dominant. Heterozygous offspring show some spinal development with a tail which is a blend of full tail cats and abnormal spine development seen in homozygous individuals.

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A cat with a blue eye on the left and a green eye on the right.

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A cat with a blue eye on the left and a green eye on the right.

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Mendals law

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Dominant

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Homozygous

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Genetic Drift

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Mutiple alleles

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lethal allels

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Monohybrid Cross

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Test cross

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meiosis

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Dihybrid Cross

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Genetic Variation #biology