GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mutations
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Parents of offspring
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Sibling DNA
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Environmental Factors
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Detailed explanation-1: -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).
Detailed explanation-2: -Because of recombination, siblings only share about 50 percent of the same DNA, on average, Dennis says. So while biological siblings have the same family tree, their genetic code might be different in at least one of the areas looked at in a given test. That’s true even for fraternal twins.
Detailed explanation-3: -Answer: Mitosis. A single cell splits during the mitosis stage to give rise to similar cells known as daughter cells.
Detailed explanation-4: -Factors such as light, temperature and pollution could permanently alter our DNA and gene expression, particularly as climate change continues.