Genetics of Eye Color in Fruit Flies

The video tutorial explains sex-linked traits using examples of eye color in fruit flies and color blindness in humans. It covers genetic crosses between different types of carriers and normal individuals, illustrating how dominant and recessive traits are inherited. The tutorial uses Punnett squares to predict offspring outcomes, emphasizing the role of carriers in passing on traits.

What is the dominant eye color trait in fruit flies?

• White

• Green

• Blue

• Red

In a cross between a white-eyed male and a carrier female, what fraction of the offspring are expected to be white-eyed males?

• None

• 1/4

• 1/2

• 3/4

What is the expected outcome for the female offspring in a cross between a white-eyed male and a carrier female?

• All red-eyed

• All white-eyed

• Half carrier, half white-eyed

• All carriers

In a cross between a carrier female and a normal male, what is the expected phenotype of the male offspring?

• All white-eyed

• All red-eyed

• Half carrier, half white-eyed

• All carriers

What is the expected phenotype of the female offspring in a cross between a carrier female and a normal male?

• Half carrier, half red-eyed

• All carriers

• All white-eyed

• All red-eyed

In humans, what is the dominant trait for color vision?

• No color vision

• Partial color blindness

• Normal color vision

• Color blindness

In a cross between a carrier female and a colorblind male, what fraction of the offspring are expected to be colorblind males?

• 3/4

• 1/2

• None

• 1/4

What is the expected outcome for the female offspring in a cross between a carrier female and a colorblind male?

• All colorblind

• All normal vision

• Half carrier, half colorblind

• All carriers

In a cross between a colorblind male and a normal female, what is the expected phenotype of the female offspring?

• All normal vision

• Half carrier, half colorblind

• All carriers

• All colorblind

What is the expected phenotype of the male offspring in a cross between a colorblind male and a normal female?

• Half carrier, half colorblind

• All carriers

• All normal vision

• All colorblind