Which of the following describes an organism in which two alleles for a trait are different

The cluster of developing cells from conception until birth is called an

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.