Genotype Expression

How does temperature influence the fur color of Himalayan rabbits?

• Warm temperatures activate the melanin gene, leading to black fur.

• Cool temperatures activate the melanin gene, leading to black fur.

• Warm temperatures inhibit the melanin gene, leading to white fur.

• Cool temperatures inhibit the melanin gene, leading to white fur.

What hormone primarily regulates the seasonal fur color change in Arctic foxes?

• Estrogen

• Testosterone

• Melatonin

• Adrenaline

What environmental factor primarily determines the flower color of Hydrangeas?

• Sunlight exposure

• Soil pH

• Water availability

• Air temperature

How do lac-positive bacteria appear on MacConkey Agar?

• They appear yellow due to high pH.

• They appear pink due to acid production.

• They appear clear, indicating no lactose breakdown.

• They appear green due to chlorophyll production.