A species of orchid comes m two varieties yellow and purple

A species of orchid comes m two varieties: yellow and purple. Bumblebees pollinate the flowers in their search for a nectar reward However, if a bee goes to a yellow flower and fails to find a nectar reward, it will then go to the purple flower, and then back to the yellow flower if the purple flower also fails it. In this way. the least-common flower color has a higher fitness (more bee visits per flower that exists of that color). What type of selection is exemplified here Heterozygote advantage Phenotypic plasticity Genetic drift Mutation-selection balance Frequency-dependent selection Which of the following is the difference between a phenotype and an adaptation An adaptation is a special type of phenotype that increases fitness An adaptation occurs only in outwardly expressed phenotypes An adaptation occurs only in currently-evolving populations An adaptation is a special type of phenotype that has led to the creation of a new species An adaptation results in overdominance or underdominance True or False: Even if two different phylogenetic trees are based on the same exact data, they may both be correct True False What is the relationship between genetic drift and heterozygosity As genetic drift increases, heterozygosity increases As genetic drift increases, heterozygosity does not change There is no relationship between genetic drift and heterozygosity As genetic drift increases, heterozygosity decreases As genetic drift decreases, heterozygosity decreases

Solution

18. a- Special type of phenotype that increases fitness.

19-true

20 d-

17-e-frequency dependent selection