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What is the most common cause of variation in the offspring of sexually reproducing organisms?
Sexual reproduction has the potential to produce tremendous genetic variation in offspring. This variation is due to independent assortment and crossing-over during meiosis, and random union of gametes during fertilization.
What causes variation in sexually reproducing organisms?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).
What causes genetic variation in meiosis?
Genetic variation is increased by meiosis Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I.
What causes inheritable variation?
Variation that is inheritable is due to differences in the alleles (or genetic material). This comes from meiosis, eg independent assortment / gametes with ½ chromosomes so mix of 2 parents. Non inheritable variation is due to environmental factors.
How does genetic variation occur during the development of offspring?
How do variations occur in offspring?
Variations occur due to sex chromosomes. Variations arising in germplasm (genes) of the organism are heritable. In zygote formation, gene pattern of both parents come together, that causes some variations between parents and offsprings and amongst offsprings also.
What is the cause of variation?
Major causes of variation include mutations, gene flow, and sexual reproduction. DNA mutation causes genetic variation by altering the genes of individuals in a population. Gene flow leads to genetic variation as new individuals with different gene combinations migrate into a population.