Phenotype and Genotype Concepts

The video tutorial introduces key genetic vocabulary such as alleles, homozygous, and heterozygous. It explains the concepts of genotype and phenotype, and demonstrates how to solve genetic problems using Punnett squares. Examples include predicting outcomes for plants, bears, and jellyfish, focusing on dominant and recessive traits.

What is an allele in genetics?

• A recessive trait

• A dominant trait

• A molecular form of a gene

• A type of cell

What does it mean if an organism is homozygous?

• It has one dominant and one recessive allele

• It has two different alleles

• It has no alleles

• It has two identical alleles

How is phenotype different from genotype?

• Phenotype is the genetic makeup, genotype is the physical expression

• Phenotype is always dominant

• Phenotype is the physical expression, genotype is the genetic makeup

• Phenotype and genotype are the same

In a Punnett square, what does a genotype of 'capital T lowercase t' indicate?

• Heterozygous

• No alleles present

• Homozygous recessive

• Homozygous dominant

What is the phenotype of a plant with a genotype of 'capital T lowercase t'?

• Short

• No growth

• Tall

• Medium

What is the expected phenotype of a bear with a genotype of 'capital B lowercase b'?

• Black fur

• Brown fur

• Spotted fur

• White fur

In a cross between a homozygous dominant black bear and a heterozygous bear, what percentage of offspring are expected to have black fur?

• 75%

• 100%

• 50%

• 25%

What is the genotype of a jellyfish with unbranched tentacles if branched is dominant?

• Lowercase b lowercase b

• Capital B lowercase b

• No alleles

• Capital B capital B

In a cross between two heterozygous plants with red berries, what percentage of offspring are expected to have white berries?

• 50%

• 75%

• 0%

• 25%

What is the expected phenotype ratio for offspring from two heterozygous plants with red berries?

• 1 red: 3 white

• 3 red: 1 white

• 4 red: 0 white

• 2 red: 2 white