Question

1- If handedness is codominant, an individual with HLHL is left-handed and an individual with HRHR is right-handed. What proportion of the offspring will be ambidextrous (HRHL) if an HRHL individual mates with an HLHL individual?

a. 0.25

b. 1.00

c. 0.50

d. 0.00

e. 0.75

2- A grasshopper species has either a green or a brown body color. The allele for green body color (G) is dominant and the allele for brown body color (g) is recessive. If a homozygous dominant individual is crossed with a heterozygous individual, what proportion of the offspring will be homozygous recessive?

a. 0.50

b. 0.00

c. 0.25

d. 1.00

e. 0.75

3- A species of salamander comes in two main forms; a solid gray body color (GG) and a solid red body color (gg). A separate gene, however, expresses a solid gray line (LL, Ll) along the dorsal surface (back), from head to tail. Otherwise, there is no line and the salamander is all gray or all red. When you cross a homozygous dominant for gray body color and dorsal line with a homozygous recessive for red body color without a gray dorsal line, half of the offspring are all gray and half are all red. What is the best explanation for this?

a. The loci for body color and gray line are on the same chromosome and do not segregate independently.

b. Mutations occurred, which changed the red body color to gray.

c. All gray individuals with red lines died before birth.

d. All red individuals with gray lines died before birth.

4- Remember that Labrador retrievers have two (2) genes that determine their coat color. BB and Bb dogs are black as long as they have the color expression (EE or Ee) genes. If they are bb and have the color expression genes, they are chocolate. If they are ee, they are yellow, regardless if they are BB, Bb, or bb. What proportion of puppies produced by an Eebb and eeBb cross would be chocolate?

a. 0.00

b. 0.50

c. 0.75

d. 1.00

e. 0.25

5- Birds have a ZZ and a ZW sex determination system, such that males are ZZ. If you cross a male with a long bill and a long tail with a female with a long bill and a short tail, you get the following results:

            Half of the males have a long bill and a short tail.

            The other half of the males have a long bill and a long tail.

            Half of the females have a long bill and a short tail.

            The other half of the females have a short bill and a short tail.

What is the best explanation for this?

a. The genes mutated.

b. The genes are linked.

c. The genes have incomplete dominance.

d. The genes are codominant.

Answer 1

Felt great to answer. Good luck!