Suppose you examined a pedigree of a large family, going back 6 generations. in generation 5, a woman ("g5w") has a serious genetic disease--its first incidence in the family. in the next generation, three of her offspring--two boys and one girl--are affected, with one daughter unaffected. what is the most likely explanation? (a) g5w's parent--the one who married into the family--carried the disease allele (but wasn't affected), and it is autosomal dominant.(b) a mutation in one of the g5w's parents, during gamete formation, created an x-linked dominant disease allele.(c) a mutation in g5w created an autosomal dominant disease allele.(d) the disease allele is recessive and x-linked; g5w's spouse also has the allele.

B: A mutation in one of G5W's parents, during gamete formation, created an X-linked dominant disease allele.

You need to analyze the sex gametes.

Boys are XY

Girls are XX

If you have an X-linked dominant disease you need only one affected X gamete to have the disease.

The mother has XX' where X' is de affected and reproduce with a healthy man XY and breed unhealthy boys, but because of the heterozygous gametes you could also have healthy ones XX and XY

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.