On the island of Notion, in the Factotum Archipelago, there lives a population of pencil bears. A portion of these bears have silky fur, and as a result, are much better surfers. The texture of the fur is determined by a single autosomal locus with two alleles: S (trait allele) and s (wild type allele). In a recent study, researched collected the values in the following table:
Phenotype | ||
Genotype | Silky Fur | Wild-type Fur |
SS | 90 | 10 |
Ss | 100 | 50 |
ss | 10 | 90 |
The S allele frequency in this population is 0.20, and the genotypes are in Hary-Weinberg proportions at the locus.
If two heterozygous (Ss) bears mate, what proportion of their offspring who have wild-type fur will be have the ss genotype?
A.
0.54. |
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B. 0.50. |
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C. 0.57. |
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D. 1.00. |
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E. 0.04. |
Reset Selection
1.For a pair of genes with alleles:
A (dominant)
a (recessive)
at the first locus; and
B (dominant)
b (recessive)
at the second locus,
that operate in a duplicate dominant epistatic manner, what
proportion of offspring from a doubly-heterozygous mating are
expected to show the recessive phenotype?
A. 9/16. |
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B. 1/16. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
C. 0.5. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
D. 1 (it's dominant). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
E. 7/16. 7.
a. Black (tastes like licorice); b. Chocolate (tastes like chocolate); c. Yellow (tastes like vanilla). There are two genes that control for this phenotype, acting in a recessive epistatic manner. The two-locus genotypes that correspond to the phenotypes are: A_B_ (codes for Licorice); aaB_ (codes for Chocolate); __bb (codes for Vanilla). Note that the alleles at the two loci are: A (dominant), a (recessive), (Locus 01) B (dominant), b (recessive). (Locus 02) If two doubly heterozygous Licorice Labs mate, what is the expected proportion of Licorice fluffernutter progeny?
7. If a marker locus with two alleles A and B and respective allele frequencies p and q is in Hardy-Weinberg Equilibrium, the population BB genotype frequency is:
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Answer :
0.54
Explanation:
On the island of Notion, in the Factotum Archipelago, there lives a population of pencil bears....
On the island of Notion, in the Factotum Archipelago, there lives a population of pencil bears. A portion of these bears have silky fur, and as a result, are much better surfers. In fact, if you are a pencil bear and a great surfer, you must have silky fur. The texture of the fur is determined by a single autosomal locus with two alleles: S (trait allele) and s (wild type allele). In a recent study, researched collected the values...
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