From the following list, identify the types of chromosome chan...

Question

From the following list, identify the types of chromosome changes you expect to show phenotypic consequences.

Pericentric inversion

Accepted Answer

Hi, everyone. Let's take a look at this practice problem together, identify the correct statements about inversions. The answer options are a inversions can result in duplication or deletion of genes in gametes. B. Inversions can result in exchange of genetic material between non homologous chromosomes. C inversions do not affect the phenotype of an individual and D all statements are correct. Now, during inversions, chromosome segments are flipped 100 and 80 degrees. A picture that shows inversions is on the screen. The chromosomes are represented by the blue lines. The top chromosome is a normal chromosome. The gene order is ABC D and the centromere is in between genes B and C. The middle chromosome depicts a paracentric inversion where the centromere is not involved. The gene order is A B DC and the centromere is between genes B and D. Now that bottom chromosome is an example of a peri centric inversion and this does involve the centromere. So the gene order is now a CBD and the centromere is between genes C and B crossing over between a chromosome with an inversion and a normal chromosome is achieved through an inversion loop. Now a picture of that loop is on the screen. The red brown lines depict the normal chromosome and the inversion loop that is created on the inverted chromosome is depicted in the blue lines. Due to this inversion loop, crossover products can result in duplication or deletion of genes depending on the type of inversion and where the centromere are located. As for the correct statement about inversions, option C is incorrect. Since inversions can alter genetic material, it can also produce effects on phenotype or gene expression. So they do affect the phenotype of an individual. So option C is incorrect. Option B is also incorrect. Inversions do not involve crossing over with a nonhomologous chromosome. Although an inversion is present, crossing over is still with its homologous chromosome. So option B is also incorrect. That means option D all statements are correct is not the right answer. The right answer is option. A inversions can result in duplication or deletion of genes in gas. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.

From the following list, identify the types of chromosome changes you expect to show phenotypic consequences.
Pericentric inversion

Key Concepts

Chromosome Structure

Pericentric Inversion

Phenotypic Consequences

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