Which of the above are examples of incomplete penetrance? Some women with a muta
ID: 72274 • Letter: W
Question
Which of the above are examples of incomplete penetrance?
Some women with a mutant BRCAI allele develop breast cancer, but others do not.
Some people with Marfan’s syndrome have only mild symptoms (such as being tall and thin with long, slender fingers), while others also experience life-threatening complications involving the heart and blood vessels.
A father with blood type A and a mother with blood type B can have a child with blood type O.
For some plant species, a cross between a true-breeding individual with red flowers and a true-breeding individual with white flowers produces progeny that have pink flowers.
Two of the above are examples of incomplete penetrance.
2.
PGCs have a more closed chromatin state and have less DNA methylation.
PGCs have a more open chromatin structure that somatic cells and have less DNA methylation.
The amount of DNA methylation has nothing to do with how the chromatin is packaged.
a.Some women with a mutant BRCAI allele develop breast cancer, but others do not.
b.Some people with Marfan’s syndrome have only mild symptoms (such as being tall and thin with long, slender fingers), while others also experience life-threatening complications involving the heart and blood vessels.
c.A father with blood type A and a mother with blood type B can have a child with blood type O.
d.For some plant species, a cross between a true-breeding individual with red flowers and a true-breeding individual with white flowers produces progeny that have pink flowers.
e.Two of the above are examples of incomplete penetrance.
Explanation / Answer
Q1). e. Two of the above are examples of incomplete penetrance.
(c & d)
Q2). b. PGCs have a more open chromatin structure that somatic cells and have less DNA methylation.
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