Please help me answer these three questions! Which of the above are examples of

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Please help me answer these three questions!

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. The above western gel shows levels of H3K4me3 (histone H3 trimethylated at lysine residue 4) and unmodified histone H3 (H3) for a stem cell line (lane 1) and three other cell lines, including lines of normal differentiated cells and cancer cells. Which lane or lanes correspond to the cancer cell line, and is the chromatin in these cells generally open or closed? lane 3, open Q b. lane 3, closed Q c. lanes 2 and 4. open Q d. lanes 2 and 4. Closed none of the lanes can correspond to cancer cell lines Suppose that a gene affects head size in house flies and is mended as a material effect gene. The gene exists in a normal allele. H. and a recessive allele h. which causes the fly to have a small head. A female fly with a normal head is crossed to a male fly with a small head, and all the offspring have small heads. What are the genotypes of the mother and the offspring at the Head locus? mother = HH. offspring = hh mother = hh. offsprmg = Hh OR hh mother = Hh. offspring = hh mother = Hh. offspring = Hh mother = hh. offsprmg = hh

Explanation / Answer

1. Option 1 is the answer

Hint : People with a mutation in the BRCA1 gene may or may not develop cancer which cannot be predicted in such people.

2. According to literature "During the process of malignant transformation, loss of H3K4me3 occurs at TSSs of genes that undergo transcriptional inactivation as a result of promoter hypermethylation"

so the lane 2 and 4 are for cance cell lines.it is open or closed can not be said i feel.

3. seems the mother would be hh and offspring too hh

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