Through fruit fly studies, geneticists have discovered a segment of DNA called t

Question

Through fruit fly studies, geneticists have discovered a segment of DNA called the homeobox which appears to control: a. Sex development in the flies b. Life span in the flies c. Final body plan development in the flies The genotype of a red-eyed male fruit fly would be: a. XRXR b. XRXr c. XrXr d. A or B e. None of the above 3. Sex-linked traits: a. Can be carried on the Y chromosome b. Affect males and females equally c. Can be carried on chromosome 20 d. A and B e. None of the above 4. A monohybrid cross analyzes: a. One trait, such as eye color b. Two traits, such as eye color and wing shape c. The offspring of one parent 5. A female with the genotype

Explanation / Answer

Through fruit fly studies, geneticists have discovered a segment of DNA called the homeobox which appears to control:

a. Sex development in the flies

b. Life span in the flies

c. Final body plan development in the flies

The genotype of a red-eyed male fruit fly would be:

a. XRXR

b. XRXr

c. XrXr

d. A or B

e. None of the above

3. Sex-linked traits:

a. Can be carried on the Y chromosome

b. Affect males and females equally

c. Can be carried on chromosome 20

d.A and B

e. None of the above

4. A monohybrid cross analyzes:

a. One trait, such as eye color

b. Two traits, such as eye color and wing shape

c. The offspring of one parent

5. A female with the genotype “XRXr”:

a. Is homozygous for the eye color gene

b. Is heterozygous for the eye color gene

c. Is considered a carrier for the eye color gene

d. A and B

e. B and C

6. In T.H. Morgan’s experiments:

a. He concluded that the gene for fruit fly eye color is carried on the X chromosome

b. He found that his F1 generation results always mirrored those predicted by Mendelian Laws of Inheritance c. He found that his F2 generation results always mirrored those predicted by Mendelian Laws of Inheritance d. A and B e. All of the abov

e 7. In this laboratory exercise:

a. The Punnett square will allow you to predict the traits of the offspring created in your crosses

b. XR will represent the recessive allele for eye color, which is white

c. Xr will represent the dominant allele for eye color, which is red

d. All of the above 8

. In a cross between a homozygous red-eyed female fruit fly and a white-eyed male, what percentage of the female offspring is expected to be carriers?

a. 0%

b. 25%

c. 50%

d. 75%

e. 100%

9. In a cross between a white-eyed female and a red-eyed male:

a. All males will have red eyes

b. 50% of males will have white eyes

c. All females will have red eyes

d. 50% of females will have white eyes

10. In human diseases that are X-linked dominant, one dominant allele causes the disease. If an affected father has a child with an unaffected mother:

a. All males are unaffected

b. Some but not all males are affected

c. All females are unaffected

d. Some but not all females are affected

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