Kearns-Sayre syndrome is a rare genetic trait caused by a deletion of up to 10000 nucleotides from the mitochondrial DNA (mtDNA). Most individuals with this syndrome have weak eye muscles, drooping eyelids, vision loss and, often, short stature. The pedigree that shows a family affected by a mitochondrial trait such as Kearns-Sayre syndrome is: A. B. C. D.

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Kearns-Sayre syndrome is a rare genetic trait caused by a deletion of up to 10000 nucleotides from the mitochondrial DNA (mtDNA) - VCE - SSCE Biology - Question 30 - 2015 - Paper 1

Question 30

Kearns-Sayre-syndrome-is-a-rare-genetic-trait-caused-by-a-deletion-of-up-to-10000-nucleotides-from-the-mitochondrial-DNA-(mtDNA)-VCE-SSCE Biology-Question 30-2015-Paper 1.png

Kearns-Sayre syndrome is a rare genetic trait caused by a deletion of up to 10000 nucleotides from the mitochondrial DNA (mtDNA). Most individuals with this syndrome... show full transcript

Worked Solution & Example Answer:Kearns-Sayre syndrome is a rare genetic trait caused by a deletion of up to 10000 nucleotides from the mitochondrial DNA (mtDNA) - VCE - SSCE Biology - Question 30 - 2015 - Paper 1

Step 1

The pedigree that shows a family affected by a mitochondrial trait such as Kearns-Sayre syndrome is:

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Answer

The correct pedigree is D. Mitochondrial traits are typically inherited maternally, and in pedigree D, the transmission pattern aligns with this inheritance pattern, showing affected individuals in consecutive generations through maternal lines.

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