Suppose two parents, a father with the genotype AaBbCcDdee and a mother with the genotype aaBbCCDdEe, want to have children. Assume each locus follows Mendelian inheritance patterns for dominance. What proportion of the offspring will have each of the specified characteristics? Round your answers to two decimal places.
Answer
- same genotype as the father: 0.03125
- same genotype as the mother: 0.03125
- phenotypically resemble the father: 0.0078125
- phenotypically resemble the mother: 0.0078125
- phenotypically resemble neither parent: 0.0625
| Question | Answer |
| How is a true breeding round‑seeded pea plant different from a hybrid round‑seeded pea plant? | They have the same phenotype but different genotypes |
| Which of the statements can be concluded from Gregor Mendel’s experiments with pea plants? |
The inheritance of alleles of one gene does not affect the inheritance of alleles of another gene. Two recessive alleles are necessary for a recessive phenotype. |
| Red-green color blindness is an X‑linked recessive trait in humans. Polydactyly (extra fingers and toes) is an autosomal dominant trait (for this question, assume the standard Mendelian dominant/recessive pattern). Martha has normal fingers and toes and normal color vision. Her mother is normal in all respects, but her father is color blind and polydactylous. Bill is color blind and polydactylous. His mother has normal color vision and normal fingers and toes. When answering the given question, consider that the answers include the proportions of only some of the possible phenotypes; other phenotypes are also expected to occur but are not included. If Bill and Martha marry, what proportions of children with specific phenotypes would they be expected to produce? |
1/8 color‑blind girls with polydactyly, 1/8 boys with normal vision and normal fingers |
| The Talmud, an ancient book of Jewish civil and religious laws, states that if a woman bears two sons who die of bleeding after circumcision (removal of the foreskin from the penis), any additional sons that she has should not be circumcised. The bleeding is most likely due to the X‑linked disorder hemophilia. Furthermore, the Talmud states that the sons of her sisters must not be circumcised, whereas the sons of her brothers should be. | Yes, the woman is a carrier and half of her sons will be affected. Her sisters may also be carriers, but her brothers’ sons will get their X chromosomes from their mothers, who are unlikely to be carriers of the allele. |
| Suppose two parents, a father with the genotype AaBbCcDdee and a mother with the genotype aabbCcDDEe, want to have children. Assume each locus follows Mendelian inheritance patterns for dominance. What proportion of the offspring will phenotypically resemble neither parent? Round your answers to two decimal places. |
0.81 |
| Suppose two parents, a father with the genotype AaBbCcDdee and a mother with the genotype aabbCcDDEe, want to have children. Assume each locus follows Mendelian inheritance patterns for dominance. What proportion of the offspring will phenotypically resemble the mother? Round your answers to two decimal places. |
0.09 |
| Suppose two parents, a father with the genotype AaBbCcDdee and a mother with the genotype aabbCcDDEe, want to have children. Assume each locus follows Mendelian inheritance patterns for dominance. What proportion of the offspring will have the same genotype as the father? Round your answers to two decimal places. |
0.03 |
| In fruit flies, long wings (W) are dominant over short wings (w), and brown pigments (N) are dominant over yellow pigments (n). Each individual possesses two alleles for each trait. If a fly that is homozygous dominant for both traits is crossed with a fly that is homozygous recessive for both traits, what is the predicted genotype of the offspring? |
Ww and Nn |
| Suppose there is a vial containing a single generation of flies from a cross. There is an interesting phenotype where many individuals have abnormally long hairlike bristles, sensory organs extending from the dorsal thorax, as opposed to the short wirelike wild‑type bristles among the other siblings. References state that this mutant has a dominant mutation called Suave (Su) and that the phenotype of flies that are heterozygous or homozygous for Su appear phenotypically identical. Which fly should be crossed to a Suave male from this vial in order to generate progeny that help determine the male’s genotype? |
a wild‑type female sibling |
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