Genotype Ratios and Plant Traits

The video tutorial explains the genetic concepts of dominant and recessive traits in plants, focusing on long and short stem traits. It covers how to determine the genotypes of heterozygous and homozygous plants and demonstrates the use of a Punnett Square to predict offspring traits. The tutorial concludes with an analysis of genotype ratios, showing that none of the offspring will have short stems and providing a simplified ratio of genotypes.

What is the dominant trait in the plant species discussed?

• Short stems

• Long stems

• Medium stems

• No stems

What does it mean if a plant is heterozygous?

• It has two recessive alleles.

• It has two identical alleles.

• It has no alleles.

• It has one dominant and one recessive allele.

What is the genotype of a homozygous dominant plant?

• Ll

• ll

• lL

• LL

What is the purpose of a Punnett Square?

• To determine the color of flowers

• To predict the genetic makeup of offspring

• To calculate plant growth rate

• To measure plant height

What percentage of offspring will have short stems?

• 75%

• 50%

• 25%

• 0%

What is required for a plant to exhibit the recessive trait?

• Heterozygous genotype

• Homozygous dominant genotype

• Any genotype

• Homozygous recessive genotype

How many homozygous dominant offspring are expected in the cross?

• One

• Four

• Two

• Three

What is the genotype ratio of the offspring?

• 2:1

• 1:2

• 2:2

• 1:1

How can the genotype ratio 2:2 be simplified?

• 1:1

• 2:1

• 3:1

• 4:1

What does a 1:1 genotype ratio indicate?

• Equal number of homozygous dominant and heterozygous offspring

• No offspring are homozygous dominant

• All offspring are heterozygous

• All offspring are homozygous dominant