Incomplete Dominance in Flower Genetics

Mr. Philipe explains incomplete dominance in genetics, where heterozygous organisms show a blend of dominant and recessive traits. Using examples of red and white flowers, he demonstrates how crossing them results in pink offspring. He discusses phenotypic and genotypic ratios, and calculates probabilities for different outcomes. The video concludes with practical applications of these concepts.

What is the key difference between simple dominance and incomplete dominance?

• Homozygous shows the dominant trait in incomplete dominance.

• Heterozygous shows the recessive trait in incomplete dominance.

• Homozygous shows a blend in incomplete dominance.

• Heterozygous shows a blend in incomplete dominance.

How can you identify a case of incomplete dominance in a genetic problem?

• The offspring show only the recessive trait.

• The offspring show a blend of parental traits.

• The problem does not provide any clues.

• The problem states that one trait is completely dominant.

What is the result of crossing a red flower with a white flower in incomplete dominance?

• 50% red and 50% white flowers

• 100% pink flowers

• 100% white flowers

• 100% red flowers

What is the phenotypic ratio when crossing two pink plants?

• 1 red: 1 pink: 2 white

• 3 red: 1 white

• 2 red: 1 pink: 1 white

• 1 red: 2 pink: 1 white

What is the genotypic ratio when crossing two pink plants?

• 3 RR: 1 rr

• 1 RR: 2 Rr: 1 rr

• 1 RR: 1 Rr: 2 rr

• 2 RR: 1 Rr: 1 rr

What is the probability of getting a red flower when crossing two pink plants?

• 0

• 3/4

• 1/2

• 1/4

What is the probability of getting a pink flower when crossing two pink plants?

• 3/4

• 1/2

• 0

• 1/4

What is the probability of getting a white flower when crossing two pink plants?

• 3/4

• 1/4

• 0

• 1/2

Why is it impossible to have true breeding pink plants in incomplete dominance?

• Pink plants are always heterozygous.

• Pink plants are always homozygous.

• Pink plants are recessive.

• Pink plants do not exist.

How can you ensure 100% pink offspring in incomplete dominance?

• Cross two red flowers.

• Cross two white flowers.

• Cross a red flower with a white flower.

• Cross two pink flowers.