Bio Test 2 (Part 5)

11 Questions | By Ohchimonkey | Updated: Mar 21, 2022 | Attempts: 119

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A biology exam, part 5 of 5. 55 question test. Exam involving topics such as photosynthesis and cellular respiration.

Questions and Answers

1.

Some dogs have erect ears; others have drooping ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. A dog homozygous for both dominant traits is mated to a droopy-eared, silent follower. The expected phenotypic ration in the F1 generation is
- A.
  
  9:3:3:1
- B.
  
  100 percent of one phenotype
- C.
  
  1:1
- D.
  
  1:2:1
- E.
  
  None of these
2.

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If a solid red male is crossed with a solid black female to produce a red, spotted puppy, the genotypes of the parents (with male genotype first) will be
- A.
  
  Bb Ss : Bb Ss
- B.
  
  Bb Ss : Bb Ss
- C.
  
  Bb ss : Bb Ss
- D.
  
  Bb Ss : Bb ss
- E.
  
  Bb ss : Bb ss
3.

Susan, a mother with type B blood, has a child with type O blood. She claims that Craig, who has type A blood, is the father. He claims that he cannot possibly be the father. Further blood tests ordered by the judge reveal that Craig is AA. The judge rules that
- A.
  
  Susan is right and Craig must pay child support.
- B.
  
  Craig is right and doesn't have to pay child support.
- C.
  
  Susan cannot be the real mother of the child; there must have been an error made at the hospital.
- D.
  
  It is impossible to reach a decision based on the limited data availabe.
- E.
  
  None of these.
4.

Genes at one locus that affect the expression of genes at a different locus are said to be
- A.
  
  Epistatic.
- B.
  
  Linked.
- C.
  
  Codominant.
- D.
  
  Penetrant.
- E.
  
  Alleles.
5.

Genes that are located on the same chromosome
- A.
  
  Tend to be inherited together.
- B.
  
  Will appear together in the gamete.
- C.
  
  Are said to be linked.
- D.
  
  May be seperated during crossing over.
- E.
  
  All of these.
6.

The rold of environmental factors on gene expression is illustrated by the
- A.
  
  Varying plant height of genetically identical yarrow plants when grown at different elevations.
- B.
  
  Flower color of hydrangeas grown in soils of differing pH.
- C.
  
  Depression response that some persons make to very stressful situations.
- D.
  
  Fur pattern of Himalayan rabbits.
- E.
  
  All of these.
7.

The reason for the darker fur on the tail, ears, nose, and legs of a Siamese cat is
- A.
  
  Incomplete dominance.
- B.
  
  The activity of a heat-sensitive enzyme involved in melanin production.
- C.
  
  Quantitative inheritence.
- D.
  
  Epistasis.
- E.
  
  The presence of different alleles for fur color in these regions.
8.

A graph of phenotypic variation similar to the illustration below strongly suggests
- A.
  
  Incomplete dominance.
- B.
  
  Codominance.
- C.
  
  Epistasis.
- D.
  
  Polygenic inheritance.
- E.
  
  Environmental effects on phenotype.
9.

An autosomal recessive disorder
- A.
  
  Requires that only one parent be a carrier.
- B.
  
  Displays its symptoms only in heterozygotes.
- C.
  
  Is more frequent in males than females.
- D.
  
  Will appear only in children of parents who both carry the gene.
- E.
  
  Is dominant in females.
10.

A color-blind man and a woman with normal vision whose father was color blind have a son. Color blindness, in this case, is caused by an X-linked recessive gene. If only the male offspring are considered, the probability that their son is color blind is
- A.
  
  .25 (or 25 percent)
- B.
  
  .50 (or 50 percent)
- C.
  
  .75 ( or 75 percent)
- D.
  
  1.00 (or 100 percent)
- E.
  
  None of these.
11.

If a daughter expresses an X-linked recessive gene, she inherited the trait from
- A.
  
  Her mother.
- B.
  
  Her father.
- C.
  
  Both parents.
- D.
  
  Neither parent.
- E.
  
  Her grandmother.