Question

Biologists once assumed that the phenotype of a dominant allele would always be the most common phenotype in a population. Which finding led biologists to a different conclusion? the discovery that most organisms have pairs of like chromosomes and, therefore, a pair of alleles for many traits the discovery that dominant traits are adaptive and recessive traits help stabilize the population the discovery of populations in which the phenotype of the recessive allele help a population survive the discovery that populations undergo evolution when they are exposed to the process of natural selection

Answer 1

I think the self-fertilisation of filial 1 generation lead biologists to a different conclusion, with 3 progeny having dominant trait and 1 progeny with ressive trait

Answer 2

Answer:

Dominant traits are not always the common phenotype

Explanation:

Dominant allele is the allele that expresses itself over the repressed allele. It does not mean that it would be the common phenotype in a population. This was discovered when the results of the Mendel's experiment were analyzed and it was found that the dominant allele didn't always be the most common phenotype, sometimes even the recessive allele could be the most common phenotype.

A prime example of this is also the case of Huntington's disease. This disease is a trait of the dominant allele, but it affects only one in 30000 people in the US.