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.

Human Anatomy & Physiology (11th Edition)
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QUESTION 18
Which of the following statements about Transmission Ratio Distortion, as exemplified by the SD (Segregation Distorter)
system in Drosophila, is TRUE?
O 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.
O 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.
Transcribed Image Text:QUESTION 18 Which of the following statements about Transmission Ratio Distortion, as exemplified by the SD (Segregation Distorter) system in Drosophila, is TRUE? O 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. O 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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