EVOLUTION
HISTORICAL CONTEXT FOR EVOLUTIONARY THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Crossing over
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Sexual reproduction
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Mutations
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Homologous structures
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Detailed explanation-1: -Answer and Explanation: The answer is C. Mitosis of fertilized eggs. Mitosis of fertilized eggs is not a source of genetic variation.
Detailed explanation-2: -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-3: -Mutations are the original source of genetic variation. A mutation is a permanent alteration to a DNA sequence.
Detailed explanation-4: -The genetic diversity has three different sources: mutation, recombination and immigration of genes.
Detailed explanation-5: -Definition. Two chromosomes in a pair – normally one inherited from the mother and one from the father. For example, the two copies of Chromosome 1 in a cell would be referred to as homologous chromosomes.