A rare rain-forest orchid has 4 alleles for flower color: A1, A2, A3, and A4. Individual orchids receive two of the four possible alleles. After 30 years of monitoring, only orchids with the A1A1 genotype can be found. What best describes this observation?
The A1 allele has gone to fixation.
The orchid population has crashed and there are only a few left.
Heterozygous flowers were superior.
Homozygous recessive individuals were selected against.
The population was at equilibrium.