Asked by bob
what is the definition of crossing over in biology, write 1 sentence, then write 2 simple examples, then 1 sentence using the words
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Crossing over is the exchange of corresponding DNA segments between non-sister chromatids of homologous chromosomes during prophase I of meiosis, producing genetic recombination.
Example 1: Two pea plants with different flower-color alleles can produce offspring with new color combinations because of crossing over.
Example 2: In humans, crossing over between maternal and paternal chromosomes makes each sperm or egg genetically unique, so siblings differ genetically.
Crossing over increases genetic variation by shuffling alleles between homologous chromosomes.
Example 1: Two pea plants with different flower-color alleles can produce offspring with new color combinations because of crossing over.
Example 2: In humans, crossing over between maternal and paternal chromosomes makes each sperm or egg genetically unique, so siblings differ genetically.
Crossing over increases genetic variation by shuffling alleles between homologous chromosomes.
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