Genotype Expression

Mr. Anderson's video explores how environmental factors influence genotype expression, affecting phenotypes. He discusses examples like the Himalayan rabbit, which changes fur color based on temperature, and Arctic animals that adapt their color seasonally. Plants, such as hydrangeas, alter flower color in response to soil pH. The video also covers bacterial gene expression, focusing on the lac operon and how it can be observed using MacConkey agar. These examples illustrate the dynamic relationship between environment and genetic expression.

What is the primary reason a Himalayan rabbit's fur changes color in cooler areas of its body?

• The presence of more sunlight

• The expression of a gene for melanin

• The rabbit's diet

• The rabbit's age

How does the Arctic fox change its fur color with the seasons?

• By changing its diet

• Through the secretion of melatonin

• By migrating to different regions

• Through genetic mutation

What is the function of melatonin in Arctic animals during winter?

• To trigger melanin production

• To increase body temperature

• To reduce melanin production

• To enhance vision

What environmental factor influences the color of hydrangea flowers?

• Temperature

• Water availability

• Soil pH

• Amount of sunlight

What role does the lac operon play in bacteria?

• It determines bacterial shape

• It regulates lactose breakdown

• It controls bacterial movement

• It helps bacteria photosynthesize

How can MacConkey agar be used in bacterial studies?

• To measure bacterial growth rate

• To differentiate between lac positive and lac negative bacteria

• To identify bacterial species

• To test bacterial resistance to antibiotics

Which of the following is NOT a factor affecting gene expression in the examples discussed?

• Soil pH

• Temperature

• Wind speed

• Presence of lactose