1. In guinea pigs, black fur (B) is dominant over white fur (w). You have a blac
ID: 94243 • Letter: 1
Question
1. In guinea pigs, black fur (B) is dominant over white fur (w). You have a black guinea pig, and want to try to determine its genotype. One way to do so would be to mate your guinea pig with another guinea pig and see what the resulting offspring looked like. What genotype of breeder guinea pig would be most helpful to determine your guinea pig's genotype?
A. A homozygous dominant guinea pig (BB)
B. A heterozygous guinea pig (Bw)
C. A mutant trisomy guinea pig (BBB)
D. A homozygous recessive guinea pig (ww)
2. Match the following terms with their symbolic representation
3. Sodium benzoate is a bitter chemical often used in tiny amounts as a food preservative. The ability of humans to taste sodium benzoate is caused by a dominant allele, T. The recessive allele ("non-taster") is n.
What are the genotypes of a "taster" and what are the genotypes of a "non-taster"?
A. Tasters: TT or Tn
Non-tasters: nn or nT
B. Tasters: TT or Tn
Non-tasters: nn
C. Tasters: T
Non-tasters: n
D. Tasters: TT or Tt
Non-tasters: NN or Nn
E. Tasters: Tn or nT
Non-tasters: nn
Terms Symbolic Representation Homozygous recessive A. aa Hemizygous recessive B. XaY Homozygous Dominant C. XAXA Heterozygous D. AaExplanation / Answer
Ans.1) “D” (To determine the genotype of the guinea pig, test cross would be preferred method. Hence, a homozygous recessive guinea pig (ww) would be helpful.)
2.) Homozygous recessive -- (A) aa
Hemizygous recessive -- (B) XaY
Homozygous Dominant – (C) XAXA
Heterozygous – (D) Aa
3.) “B” Tasters: TT or Tn, Non-tasters: nn
(The non tasters are homozygous recessive)
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