sec 1 - exam 1 - ch 1 - ch 2 - 2022 (t2)

A dominant allele.....

• is expressed half of the time

• is never expressed

• is expressed in homozygous dominant and heterozygous individuals

• is only expressed in homozygous individuals

If two white mice are bred together (white fur is a recessive trait), what must be true of their offspring?

• they will all be white

• they could be either white or black

• they will all be black

• they are likely to be half white and half black

 

What term denotes the physical expression of a gene?

• genotype

• phenotype

• appearance

• homologous

 What is a gene?

• An entire chromosome that  codes for a trait

• a piece of clothing

• a piece of a DNA on chromosome that codes for a trait

• Chemical messengers in your brain that code for a trait

When you cross two parents, each parent is responsible for passing _______ of their two alleles for each individual trait.

• 2

• 1

• 4

• 3

Grey (G) fur is dominant to brown (g) fur in mice. What would be the genotype of a mouse that is homozygous dominant?

• GG

• Gg

• gg

• GGG

 

If Mom is type A, and Dad is type AB, can their kid be type o?

• Yes

• No

Agglutination occurs when blood type antibodies come into contact with blood type antigens to which they correspond. What is agglutination?

• Red blood cells burst and die

• A system in which transfusions can occur

• Antibodies bind to the antigens and then render the red blood cell non-functional

• Red blood cells are clumped together and become non-functional

Someone with type A blood donates whole blood to someone with type B blood. What occurs?

• The transfusion goes well, no negative effects.

• Agglutination occurs in the person with type B blood. The donor cells are affected.

• Agglutination occurs in the person with type B blood. Their own blood cells are affected.

• The person with type B blood will die.

If two parents are heterozygous for type A blood, what is the probability that their offspring would have type O blood?

• 100%

• 50%

• 25%

• 75%