Biology Unit 2 Quiz Review

What is the key difference between a dihybrid cross and a monohybrid cross?

• A dihybrid cross involves two traits, while a monohybrid cross involves only one trait.

• A dihybrid cross is more complex than a monohybrid cross.

• A dihybrid cross uses a Punnett square, while a monohybrid cross uses a fork-line method.

• A dihybrid cross is used for plants, while a monohybrid cross is used for animals.

According to the text, what is the main reason why Mendel did not observe linkage in his experiments?

• He only studied traits that were on different chromosomes.

• He did not study enough traits.

• He only studied dominant traits.

• He did not have the technology to observe chromosomes.

What happens to homologous chromosomes during meiosis that can lead to new combinations of genes?

• They remain unchanged.

• They replicate themselves.

• They separate completely.

• They exchange genetic information.

What happens to the agouti gene in mice when a pregnant mother is fed a special diet?

• The agouti gene is turned off, leading to healthy brown offspring.

• The agouti gene is deleted from the genome.

• The agouti gene causes the offspring to become albino.

• The agouti gene is duplicated, increasing its expression.

The text mentions that identical twins separated at birth can have different traits. What does this suggest about the role of environment in shaping traits?

• The environment is more important than genetics.

• The environment can influence traits even with identical genes.

• The environment has no impact on traits.

• The environment can change a person's DNA.

What is the main reason why identical twins can have different health conditions even though they have the same genes?

• They have different personalities.

• They have different blood types.

• They are exposed to different environments.

• They have different numbers of chromosomes.

Using the fork-line method, determine the final phenotypic ratios for a cross between the parents GgWw x ggWw where G is grey, g is white, W is wide, and w is thin.

• 6 grey, wide; 6 grey, thin; 2 white, wide; 2 white, thin

• 6 grey, wide; 2 grey, thin; 6 white, wide; 2 white, thin

• 6 grey, wide; 2 grey, thin; 2 white, wide; 6 white, thin

• 4 grey, wide; 4 grey, thin; 4 white, wide; 4 white, thin

Why are muscle cells different from skin cells even though they have the same DNA?

• Muscle cells have different DNA than skin cells.

• Muscle cells are larger than skin cells.

• Different sections of DNA are switched on and off in each type of cell.

• Muscle cells are exposed to different environments than skin cells.

It is important for individuals to make healthy lifestyle choices, not only for their own well-being but also for the health of their future children, because:

• Healthy choices can positively impact both personal health and the health of future generations.

• Unhealthy habits only affect the individual and not their children.

• Future children's health is determined solely by genetics, not lifestyle choices.

• Making healthy choices has no effect on anyone's well-being.

What is the main advantage of using the fork-line method over a Punnett square for dihybrid crosses?

• The fork-line method is easier to understand.

• The fork-line method is faster and less prone to errors.

• The fork-line method is more visually appealing.

• The fork-line method is more accurate.