Scelta multipla
What is the term for variation among members of the same species?
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12. Meiosis
Genetic Variation During Meiosis
Scelta multipla
Crossing over involves each of the following EXCEPT:
A
The transfer of DNA between two non-sister chromatids.
B
The transfer of DNA between two sister chromatids.
C
The formation of a synaptonemal complex.
D
The alignment of homologous chromosomes.
E
All of the above are involved in crossing over.
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Understand the concept of crossing over: Crossing over is a process during meiosis where homologous chromosomes exchange genetic material. This occurs between non-sister chromatids of homologous chromosomes, leading to genetic variation.
Identify the role of non-sister chromatids: In crossing over, DNA is exchanged between non-sister chromatids of homologous chromosomes, not between sister chromatids. Sister chromatids are identical copies of a chromosome connected by a centromere.
Examine the formation of the synaptonemal complex: This is a protein structure that forms between homologous chromosomes during meiosis and facilitates the process of crossing over by holding the homologs together.
Consider the alignment of homologous chromosomes: Before crossing over can occur, homologous chromosomes must align closely along their lengths, a process known as synapsis, which is crucial for the exchange of genetic material.
Evaluate the exception: Since crossing over involves non-sister chromatids, the transfer of DNA between sister chromatids is not part of this process. Therefore, the statement 'The transfer of DNA between two sister chromatids' is the exception.
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