In experiments with laboratory populations of Drosophila melanogaster, Mukai and Burdick (1959) observed that a lethal allele maintained a higher than expected frequency. The explanation for this observation is that, at equilibrium, the selective advantage of the lethal allele when it occurs in heterozygotes balances the disadvantage of the allele in homozygotes, and is termed

solvent

happy to

pls mark as brainliest

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.