객관식
What is the term for variation among members of the same species?
104
views
12. Meiosis
Genetic Variation During Meiosis
객관식
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.
검증된 단계별 안내1
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.
관련 영상
관련 실천
