Multiple Choice
Which type of chromosomal rearrangement occurs when part of a chromosome breaks off and attaches to a nonhomologous chromosome?
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6. Chromosomal Variation
Chromosomal Rearrangements: Translocations
Multiple Choice
Which of the following represents the chromosomal segregation into gametes after a reciprocal translocation caused by adjacent-1 segregation? N=Normal chromosome T = Tanslocated chromosome
A
(N2 T1) and (N1 T2)
B
(N1 T1) and (N2 T2)
C
(T1 T2) and (N1 N2)
Verified step by step guidance1
Understand the concept of reciprocal translocation: This is a chromosomal abnormality caused by the exchange of segments between two non-homologous chromosomes. It can lead to different segregation patterns during meiosis.
Learn about adjacent-1 segregation: In this type of segregation, non-homologous centromeres go to the same pole during meiosis, resulting in gametes that have one normal and one translocated chromosome from each pair.
Identify the chromosomes involved: In the problem, N1 and N2 represent normal chromosomes, while T1 and T2 represent translocated chromosomes.
Apply the adjacent-1 segregation pattern: This pattern results in gametes that contain one normal chromosome and one translocated chromosome from each pair, leading to combinations like (N2 T1) and (N1 T2).
Compare the options: Evaluate the given options to determine which one matches the expected outcome of adjacent-1 segregation, which is (N2 T1) and (N1 T2).
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