Genetics: Dominance and Flower Colors

Professor Gustavo explains genetic concepts focusing on absence of dominance, intermediate dominance, and codominance using ladybug color examples. He discusses how different genetic crosses result in various phenotypes, such as orange ladybugs from red and blue parents. The video also covers practical problem-solving with genetic crosses, using flower color as an example to illustrate how to achieve specific phenotypic ratios.

What is the main topic introduced by Professor Gustavo at the beginning of the video?

• Genetic mutations

• Absence of dominance

• Natural selection

• Genetic engineering

In the example of intermediate dominance, what color are the F1 generation ladybugs?

• Green

• Orange

• Blue

• Red

What percentage of F2 generation ladybugs are orange in the intermediate dominance example?

• 25%

• 50%

• 75%

• 100%

In the codominance example, what is the phenotype of the F1 generation ladybugs?

• Blue with red spots

• Orange

• Red with blue spots

• Green

What percentage of F2 generation ladybugs are red with blue spots in the codominance example?

• 25%

• 50%

• 100%

• 75%

How does codominance differ from intermediate dominance?

• Only one phenotype is visible in codominance

• Codominance results in a new phenotype

• Both phenotypes are visible in codominance

• Neither phenotype is visible in codominance

What are the possible flower colors in the Marvel plant example?

• Red, yellow, and blue

• Red, blue, and green

• Red, white, and pink

• Yellow, white, and pink

What is the genotype of pink flowers in the Marvel plant?

• Homozygous pink

• Heterozygous

• Homozygous red

• Homozygous white

To obtain 50% white flowers in the Marvel plant, which cross is necessary?

• Red x Pink

• Red x White

• White x Pink

• White x White

What is the result of crossing a white flower with a pink flower in the Marvel plant?

• 100% pink flowers

• 50% white and 50% pink flowers

• 100% white flowers

• 50% red and 50% white flowers