Genetics Grade 9 GOLD

DNA stands for ___?

Which of the following describes a "gene"?

• It is a small section of a chromosome.

• A section of DNA that codes for a certain protein.

• A long double helix strand that contains different codes.

• A part of the cell that creates proteins.

Which among the following is a blood type that contains both antigen A and B?

• Type A

• Type B

• Type AB

• Type O

In your understanding, describe what is a phenotype.

What is your blood type?

• Type A

• Type B

• Type AB

• Type O

Suppose white-furred dog breeds with a black-furred dog and all of their offspring have a phenotype of gray fur. What does the gene for fur color in dogs appear to be an example of?

• Codominance

• Incomplete dominance

• Sex-linked trait

• All of the above

A botanist put red flowers and white flowers inside a greenhouse. After quite some time the plants produced an offspring that has a pink color. This scenario shows incomplete dominance.

• True

• False

Females have both _ chromosomes.

• X

• X and Y

• Y

• None of the above.

The following are distinct characteristics of a Codominance inheritance, except ___?

• The phenotypes (observable trait) of both alleles are present in an offspring.

• Red fur cow bred with a white fur cow produced an offspring with a white-red spotted cow.

• A white-feathered bird bred with a black-eathered bird produced an offspring with a gray feathered bird.

• An example of codominance inheritance is our blood type.

Identify 3 examples of sex-linked traits.

• Colorblindness

• Hemophilia

• High blood pressure

• Blue eyes