QUESTION 18 Which of the following statements about Transmission Ratio Distortion, as exemplified by the SD (Segregation Distorter) system in Drosophila, is TRUE? Transmission ratio distortion is caused by inversions on the SD chromosome. O The SD system includes a cis-acting, shortened version of a RanGAP protein and a trans-acting DNA repeat locus. O Distortion operates only in males, due to sex-linkage. The SD chromosome distorts transmission ratios by killing gametes that do not contain it. The loci that make up the SD system assort independently of each other at meiosis.

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.