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Chapter 4: Problem 3

What is meant by a gene interaction? How can a gene interaction be explained at the molecular level?

Short Answer

Expert verified
Gene interaction refers to the situation where several genes contribute to a specific phenotypic trait. At the molecular level, gene interaction involves interaction of proteins produced by each gene. The proteins interact to produce a phenotype. Any change in any of the genes can affect the protein and hence the resultant trait.

Step by step solution

01

Understanding the Concept of Gene Interaction

Gene interaction refers to the situation where several genes influence a particular phenotypic trait. In genetics, it is not always that one gene is responsible for one trait; often, there are multiple genes involved in shaping a single trait, which is what is referred to as gene interaction.
02

Significance of Gene Interaction

Understanding gene interaction is crucial since it sheds light on how traits are inherited. Genes do not function in isolation; they interact with other genes, shaping up the traits. Gene interaction greatly influences the concept of inheritance and trait propagation.
03

Explaining Gene Interaction at Molecular Level

At the molecular level, gene interaction can be traced to protein interactions. Each gene codes for a protein, and these proteins interact in the cell to produce a phenotype. Suppose there is a trait governed by two genes. Each gene produces a different protein, and these two proteins interact to produce a visible trait. A change or mutation in either gene could affect the interaction and consequently affect the outcome or the trait. DNA mutations, such as deletions, insertions or substitutions, can significantly alter protein production, leading to observable changes in the phenotype.

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Most popular questions from this chapter

In cats, a temperature-sensitive allele produces the Siamese phenotype, in which the cooler extremities are dark and the warmer trunk area is lighter. A Siamese cat that spends most of its time outside was accidentally injured in a trap and required several stitches in its right front paw. The veterinarian had to shave the fur from the paw and leg, which originally had rather dark fur. Later, when the fur grew back, it was much lighter than the fur on the other three legs. Do you think this injury occurred in the hot summer or cold winter? Explain your answer.

Discuss the differences among sex-influenced, sex-limited, and sex-linked inheritance. Give examples.

Let's suppose a recessive allele encodes a completely defective protein. If the functional allele is dominant, what does that tell you about the amount of the functional protein that is sufficient to cause the phenotype? What if the allele shows incomplete dominance?

A human disease known as vitamin D-resistant rickets is inherited as an X-linked dominant trait. If a male with the disease produces children with a female who does not have the disease, what is the expected ratio of affected and unaffected offspring?

A sex-influenced trait in humans affects the length of the index finger. A short allele is dominant in males and recessive in females. Heterozygous males have an index finger that is significantly shorter than the ring finger. The gene affecting index finger length is located on an autosome. A woman with short index fingers has children with a man who has normal index fingers. They produce five children in the following order: female, male, male, female, male. The oldest female offspring has one daughter with a man who has normal fingers. The youngest male among the five children has children with a woman with short index fingers; they have two sons. Draw the pedigree for this family. Indicate the phenotypes of every individual (filled symbols for individuals with short index fingers and open symbols for individuals with normal index fingers).
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