Which of the following is true about the alleles for hemoglobin in humans?

a)
differences in the dna sequences of alleles a and s account for the difference in the hemoglobin molecules produced.

b)
individuals with the genotype aa will have misshapen red blood cells.

c)
the difference between allele a and allele s is due to changes in the environment.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse