Natural Selection and Phenotypes

The video explains a population of blue and red circles with different genotypes and phenotypes. It highlights how natural selection acts on phenotypes, not genotypes, using an example of bacteria that eat blue circles. The process results in only red circles remaining, demonstrating natural selection's impact on phenotypes.

What are the two phenotypes observed in the population of circles?

• Red and Yellow

• Green and Yellow

• Blue and Green

• Blue and Red

Which genotype combinations result in a blue phenotype?

• Heterozygous only

• Heterozygous and Homozygous dominant

• Homozygous recessive

• Homozygous dominant only

What is the relationship between genotype and phenotype in this context?

• Phenotype determines genotype

• Genotype is irrelevant to phenotype

• Phenotype can be observed without knowing genotype

• Genotype directly determines phenotype

What is the main factor that the pink bacteria consider when choosing circles to eat?

• Shape

• Color

• Size

• Genotype

How does natural selection affect the population of circles?

• It changes their color to green

• It changes their genotypes

• It makes them larger

• It acts on their phenotypes

What happens to the blue circles during the natural selection process?

• They change shape

• They multiply

• They are eaten by bacteria

• They become red

Why did the red circles survive the natural selection process?

• They were stronger

• They were faster

• Their phenotype was red

• They were smaller

Which circles were not affected by the bacteria?

• Yellow circles

• Green circles

• Red circles

• Blue circles

What does the outcome of the natural selection process demonstrate?

• Phenotypes are crucial for survival

• Natural selection is random

• Genotypes are more important than phenotypes

• All circles are equally affected