Multiple Choice
Why does cleaving at points a and b in Figure 2 result in non-recombinant chromosomes during crossing over?
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
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Which of the following is a characteristic of recombinant offspring produced by crossing over during meiosis?
A
They possess new combinations of alleles different from either parent.
B
They result only from mutations, not from crossing over.
C
They are produced exclusively during mitosis.
D
They always have identical genotypes to one of the parents.
Verified step by step guidance1
Understand that recombinant offspring are produced during meiosis, specifically through the process of crossing over, where homologous chromosomes exchange segments.
Recognize that crossing over creates new combinations of alleles by shuffling genetic material between homologous chromosomes, which results in genetic variation.
Recall that mutations are changes in the DNA sequence and are a different source of genetic variation, not the same as recombination through crossing over.
Note that mitosis is a process of cell division that produces genetically identical daughter cells, so recombinant offspring are not produced during mitosis.
Conclude that recombinant offspring have new allele combinations different from either parent, which is the hallmark characteristic of crossing over during meiosis.
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