The isotope silicon-32 decays into phosphorus-32. silicon-32 has a half-life of 170 years and can be used to find the age of rocks it is contained in. which two statements are true regarding this scenario? pick two a) silicon-32 is the stable daughter isotope and phosphorous-32 is the unstable parent isotope. b) in a given rock sample, the amount of silicon-32 isotope gets divided in half about every 170 years. c) the half-life can be used to determine the amount of silicon-32 that has decayed from the time the closure temperature was reached. d) in a given rock sample, as the amount of silicon-32 lessens, so does the amount of phosphorous-32. e) in a given rock sample, the amount of silicon-32 is always equal to the amount of phosphorous-32.

In a hypothetical breed of dogs, coat color is controlled by two genes. there are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. consider the following crosses. cross 1: black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. f1 males and females are all black. when f1 are intercrossed, f2 males and females are black or brown. cross 2: black females from a lineage of all black dogs are crossed with tan males from a lineage where all males are tan and all females are cream. f1 males are black, f1 females are gray. when f1 are intercrossed, f2 males and females are black, brown, gray, or tan. cross 3: silver females from a lineage where all females are silver and all males are gray are crossed with brown males from a lineage of all brown dogs. f1 males and females are all gray. when f1 are intercrossed, f2 males are black, brown, gray, or tan, f2 females are cream, gray, silver, or tan. select the correct statements regarding the mode of inheritance of the coat color genes. a) both genes are x-linked. b) both genes are autosomal. c) one of the genes modifies the expression of the other gene. d) each gene has an additive effect on the intensity of coat color. e) each gene independently specifies three colors. f) one of the genes is autosomal, and the other is x-linked.