Biology Forums - Study Force

1) Use the following information to answer the next two questions.

In cattle, a polled or hornless trait (P) is dominant over a horned trait(p).

A polled bull mated with three different cows, and the following calves were born in the spring.

Cow Phenotype                 F1 Generation Phenotype
Cow 1 - Horned                       Calf 1 - Horned

Cow 2 - Polled                         Calf 2 - Horned

Cow 3 - Polled                           Calf 3 - Polled


Which of the following rows correctly identifies the genotypes of the cattle?

a.  Cow 3 - Pp                          Calf 3 - pp

b. Cow 1 - pp                             Bull - PP

c. Cow 2 - pp                            Calf 1 - Pp

d. Bull - Pp                                Calf 2 - pp





2) Which of the above cattle genotypes cannot be determined?

a. Cow 3 and Calf 3

b. Cow 2, Cow 3, and Calf 3

c. None

d. Bull, Cow 2, Cow 3, and Calf 3




3) Gregor Mendel determined a way to identify whether an organism with a dominant phenotype was heterozygous or homozygous. In a test cross, the organism with the Answer  phenotype is crossed with an organism that is homozygous Answer.

POSSIBLE ANSWER DOMINANT / RECESSIVE





4) In mice, black fur (B) is dominant over white fur (b).

Which of the following is not the correct method to determine if a mouse with a dominant phenotype has a homozygous or heterozygous genotype?


a. Test crosses need to be conducted on a mouse with a dominant phenotype to determine their genotype.

b. A mouse with a dominant phenotype should be crossed with a mouse with a recessive phenotype.

c. The black mouse should mate with white mice.

d. A mouse with a dominant phenotype should be crossed with any true breeding mouse.





5) Which of the following statements incorrectly illustrates incomplete dominance?

a. Dark brown fur crossed with white fur produces yellow fur.

b. Red flowers crossed with white flowers produce pink flowers

c. Tall plants crossed with short plants produce medium height plants.

d. A black horse crossed with a white horse produces a mixture of white and black hair in a horse.





6) Which of the following statements illustrates codominance?

a. Red flowers crossed with white flowers produce pink flowers.

b. Grey heterozygous chickens have black and white feathers.

c. Two parents with blood types A and B can have children with blood type O.

d. Individuals who are heterozygous for the sickle cell anemia allele are more resistant to malaria.




7) A pure breeding yellow bird is mated with a pure breeding blue bird. There is a lack of dominance in feather colours and all offspring are green feathered.

What are the correct genotypes of a green bird, yellow bird, and blue bird, respectively?

a. By, yy and BB

b. Yb, YY and bb

c. Bb, bb and BB

d. BY, YY, and BB






8) SEE IMAGE ATTACHED



9) Sarah and George have been married for 6 years. They had a daughter 5 years ago and her blood type is AB. Sarah had complications during her birth and was transfused with three pints of type A blood. The couple recently welcomed a new baby boy to their family.

He has the blood type O. What are Sarah and George’s genotypes?

a. Sarah's Genotype             George's Genotype
            I^AI^A                                            ii


b. Sarah's Genotype               George's Genotype
             I^AI^A                                         I^Bi


c. Sarah's Genotype                George's Genotype
                I^Ai                                             I^BI^B


d. Sarah's Genotype                George's Genotype
                 I^Ai                                              I^Bi







10) SEE THIRD AND FOURTH PHOTOS ATTACHED THEY ARE THE SAME QUESTION

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