Patterns of Inheritance Practice Test
Review the following concepts if needed:
- Patterns of Inheritance - Terminology for Genetics
- Dominant and Recessive Alleles for Genetics
- Crosses Involving Single Genes for Genetics
- Other Allelic Relationships for Genetics
- Patterns of Inheritance - Probability Theory for Genetics
- Patterns of Inheritance - Statistical Distributions for Genetics
- Crosses Involving Two or More Genes for Genetics
- Testing Genetic Ratios for Genetics
- Pedigree Analysis for Genetics
Patterns of Inheritance Practice Test
- In guinea pigs, black coat color is dominant over white. Match the correct answer in the right column with the question in the left column.
- In guinea pigs, black (B-) is dominant to white (bb). Assorting independently on a different pair of homologues, short hair (S-) is dominant to long hair (ss). In the parental generation, pure (homozygous) black, short-haired pigs are crossed to white, long-haired pigs. In the F2 we expect the following:
For each of the following definitions, give the appropriate term and spell it correctly. Terms are single words unless indicated otherwise.
- Any measurable or distinctive characteristic or trait possessed by an organism.
- The genetic endowment of an individual or cell.
- A cell produced by the union of gametes carrying identical alleles.
- A cell produced by the union of gametes carrying different alleles.
- Adjective descriptive of an allele that is not expressed in a heterozygote; also descriptive of the phenotype produced when the allele is homozygous.
- Any phenotype that is extremely rare in a natural population. (One or two words.)
- Adjective describing any pair of alleles that interact in the heterozygous condition to produce a phenotype different from those of the respective homozygotes. (One or two words.)
- Any gene that when homozygous results in the death of the individual during development.
- The proportion of individuals of a specified genotype that show the expected phenotype.
- The degree of effect produced by a given genotype under a given set of environmental conditions or over a range of environmental conditions.
Choose the one best answer.
Questions 1–5 use the following information. In guinea pigs, black coat color (governed by gene B) is a dominant trait, and white (attributed to allele b) is a recessive trait.
- A black female is testcrossed, producing six black offspring. The probability that a heterozygous black female would do this by chance alone is approximately (k) 50% (l) 25% (m) 1% (n) cannot be determined from the information given (o) none of the above
- A mating that is expected to produce 50% homozygotes and 50% heterozygotes is (a) BB × Bb (b) Bb × Bb (c) bb × Bb (d) two of the above (e) matings (a), (b), and (c) above
- When heterozygous black pigs are intercrossed, approximately what fraction of the black progeny are expected to be homozygous? (a) 4 (b) 2/3 (c) 2 (d) 3 (e) none of the above
- How many genetically different kinds of matings can be made in a population containing these two alleles (ignoring reciprocal crosses)? (a) 4 (b) 6 (c) 8 (d) more than 8 (e) none of the above
- When heterozygous black pigs are intercrossed the chance of the first two offspring being black is (a) more than 75% (b) 56% (c) 44% (d) 6% (e) none of the above
- The ABO blood groups of humans are determined by three alleles (Example 2.19). How many genotypes are possible for these phenotypes? (a) 3 (b) 4 (c) 6 (d) 8 (e) none of the above
- A mother of blood group O has a group O child. The father could be (a) A or B or O (b) O only (c) A or B (d) AB only (e) none of the above
- How many different genotypes can exist in a population with the dominance hierarchy ga > gb > gc > gd? (a) 6 (b) 8 (c) 16 (d) more than 16 (e) none of the above
- If an individual of genotype AaBbCcDd is testcrossed, how many different phenotypes can appear in the progeny? (a) 4 (b) 8 (c) 12 (d) 16 (e) none of the above
- If individuals of genotype AaBbCc are intercrossed, how many different phenotypes can appear in their offspring? (a) 3 (b) 6 (c) 8 (d) 16 (e) none of the above
- If individuals of genotype AaBbCc are intercrossed, how many different genotypes can occur in their progeny? (a) 6 (b) 8 (c) 16 (d) 21 (e) none of the above
- The minimum progeny population size allowing for random union of all kinds of gametes from AaBbCc parents is (a) 9 (b) 27 (c) 64 (d) more than 100 (e) none of the above
- The fraction of the adult offspring that is expected to be gray, fuzzy is (a) 1/4 (b) 1/2 (c) 2/3 (d) 3/4 (e) none of the above
- If fuzzy is lethal shortly after birth, the fraction of the adult progeny expected to be black, short is (a) 1/4 (b) 1/3 (c) 1/2 (d) 2/3 (e) none of the above
Questions 13 and 14 use the following information. Given that A1A1 = lethal, A1A2 = gray, A2A2 = black, B1B1 = long hair, B1B2 = short hair, B2B2 = very short hair (fuzzy), and parents that are A1A2B1B2:
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