In the nematode C. elegans, if one inhibits RNA polymerase II (the polymerase required for transcription) in oocytes, such that the fertilized eggs have no access to this polymerase, the embryos develop to the 100 cell stage and then stop dividing. Interestingly, these embryos are able to initiate the movements of gastrulation (which occurs at the 26-cells stage), and segregate the P granules (cytoplasmic determinants) that define the future germ line correctly. This suggests that:

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition. b) one-fourth of the daughters of an affected man would have this condition. c) one-half of the daughters of an affected father and a carrier mother could have this condition. d) only if a woman is xxx could she have this condition.

What evidence did mendel find that supported his law of independent assortment? a. some traits are controlled by several different genes. b. a trait can be passed on from a parent to an offspring. c. most traits have a dominant form and a recessive form. d. different traits are passed on independently of each other.

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants. d- food molecules are broken down in the cells if living things.