A gene encodes an enzyme, and there are two alleles of the gene. 65 units of the enzyme are required for the wild-type phenotype. Less than 65 units of the enzyme results in a mutant phenotype. One allele (A1) produces 50 units of the enzyme. A null allele (A2) produces 0 units of the enzyme. What is the phenotype of the A1A2 heterozygote

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

answer///africa and asia;