Multiple Choice
During meiosis, what is the probability of obtaining 25% wrinkled offspring if the parents are heterozygous for a trait with complete dominance?
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12. Meiosis
Genetic Variation During Meiosis
Multiple Choice
What is the significance of crossing-over during meiosis?
A
It increases genetic variation by exchanging DNA between homologous chromosomes.
B
It duplicates the genetic material in the parent cell.
C
It ensures that each gamete receives a complete set of chromosomes.
D
It reduces the number of chromosomes in the daughter cells.
Verified step by step guidance1
Understand that meiosis is a type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell.
Recognize that crossing-over occurs during prophase I of meiosis, where homologous chromosomes pair up and exchange segments of genetic material.
Identify that the primary significance of crossing-over is to increase genetic variation by creating new combinations of alleles on each chromosome.
Acknowledge that this genetic variation is crucial for evolution and adaptation, as it contributes to the diversity of traits within a population.
Note that while crossing-over increases genetic variation, it does not duplicate genetic material, ensure complete sets of chromosomes in gametes, or directly reduce chromosome numbers; these are other aspects of meiosis.
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