1. In a total population of 300 adults, it was found that 200 were blondes and 100 were redheads. Upon closer examination, it was found that having red hair was the result of a recessive trait. Biochemical analysis revealed that blondes composed two genotypes: homozygous (40 individuals), and heterozygous (160 individuals). Use chi-squared analysis to determine if this population is in Hardy-Weinberg equilibrium for this gene.

20 the compound al(nh3)2 has atoms of nitrogen.

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.

Aresearcher created three groups based on participants bmi: normal weight, overweight and obese. the hypothesis being tested is that the three groups differ in the mean number of artificially sweetened drinks consumed weekly. which statistical test might the researcher use, assuming a reasonably normal distribution of values.