The element carbon has multiple bonding patterns. Which bonding pattern cannot be formed by carbon?
A C-C
B. C-C-C
C. C-C-C
D. CC=C

In a population that is in hardy-weinberg equilibrium, there are two possible alleles for a certain gene, a and a. if the frequency of allele a is 0.4, what fraction of the population is heterozygous? a. 0.40 b. 0.60 c. 0.16 d. 0.48