A black guinea pig crossed with an albino guinea pig produced 12 black offspring. When the albino is crossed with a different black guinea pig, the offspring are as follows: 7 black, 5 albino. What is the best explanation for this genetic outcome? Include the genotypes of both parents and offspring for each cross described.

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

The many stone tools, fragmentary animal bones, and teeth found at gran dolina, spain, indicate that hominids there? a. processed and consumed animals and other hominids. b. did not differ appreciably from earlier asian homo erectus. c. were similar to later homo sapiens. d. none of the above