Sci 7 - Genetics

A student claims that genetic traits are always expressed exactly the same way as they appear in parents. Why is this statement incorrect?

• Traits can be influenced by both dominant and recessive alleles

• DNA only comes from one parent

• Genes are only active during childhood

• Mutations only occur in adults

How might genetic mutations benefit a species over many generations?

• They always cause harmful changes

• They can lead to new adaptations that help survival

• They only affect physical appearance

• They make all organisms exactly the same

If a genetic disorder runs in families but skips generations, what might this suggest about the trait?

• It's likely a dominant trait

• It's probably a recessive trait that only appears when two copies are inherited

• The trait randomly appears and disappears

• The trait is not actually genetic

Why would scientists need to study both parents' DNA when investigating inherited traits?

• Only the mother's DNA matters

• Only the father's DNA matters

• Each parent contributes half of the genetic material

• Parents don't share DNA with children

In genetic research, why is it important to consider ethical implications?

• Ethics only matter for medical research

• Genetic information could be misused to discriminate against people

• Ethics aren't related to genetics

• Only doctors need to worry about ethics

What is the most likely reason why identical twins have such similar traits?

• They learned to look alike

• They share exactly the same DNA

• They eat the same foods

• They chose to be identical

How might understanding genetics help farmers improve crop production?

• They can select plants with desired traits to breed

• Genetics only applies to animals

• Plants don't have DNA

• Farmers don't use scientific methods

If DNA from one human cell was stretched out straight, it would be about 6 feet long. What does this tell us about cell structure?

• Cells must be at least 6 feet long

• DNA must be very tightly packed to fit inside a tiny cell

• The DNA measurement must be wrong

• DNA exists outside of cells

How might studying genetics help doctors treat patients in the future?

• Genetics has no role in medicine

• It could help predict and prevent inherited diseases

• Doctors only use genetics to study eye color

• Genetic information is only useful for scientists

Why is it significant that humans have approximately 20,000 genes but many more traits?

• The number must be incorrect

• Genes and traits aren't related

• Multiple genes can work together to create traits

• Each trait must come from exactly one gene