Monohybrid Crosses and Ratios

The video tutorial covers monohybrid crosses, starting with an introduction and practice problems. It explains crossing homozygous dominant red plants with recessive white plants, and heterozygous red with homozygous recessive white. The tutorial also includes crossing two heterozygous peas, discussing phenotypic and genotypic ratios. Further, it explores crossing homozygous dominant and recessive plants, and heterozygous red and silver foxes. The concept of F1 cross and using two Punnett squares is introduced, followed by final practice problems with purple and white flowers.

What is the first step in setting up a monohybrid cross?

• Calculate the genotypic ratio

• Determine the phenotypic ratio

• Identify the dominant and recessive traits

• Fill out the Punnett square

In a cross between a homozygous dominant red plant and a homozygous recessive white plant, what is the phenotypic ratio?

• 4:0

• 3:1

• 2:2

• 1:1

What is the genotypic ratio when crossing a homozygous dominant red plant with a homozygous recessive white plant?

• 2:2

• 1:2:1

• 3:1

• 4:0

When crossing a heterozygous red flower with a homozygous recessive white flower, what is the phenotypic ratio?

• 1:1

• 3:1

• 2:2

• 4:0

What is the genotypic ratio for a cross between a heterozygous red flower and a homozygous recessive white flower?

• 3:1

• 1:2:1

• 2:2

• 4:0

In a cross between two heterozygous peas, what is the expected phenotypic ratio?

• 4:0

• 1:2:1

• 3:1

• 2:2

What is the genotypic ratio when crossing two heterozygous peas?

• 1:2:1

• 3:1

• 4:0

• 2:2

What does the term 'pure' refer to in genetic terminology?

• Recessive

• Homozygous

• Heterozygous

• Dominant

In an F1 cross, what is the first step you must take?

• Determine the genotypic ratio

• Make the parent cross

• Cross the offspring

• Calculate the phenotypic ratio

What is the phenotypic ratio when crossing a homozygous violet flower with a heterozygous violet flower?

• 2:2

• 3:1

• 4:0

• 1:1