Question

Glucose is generally phagostimulatory (stimulates eating) for animals. The observation that cockroach populations exposed to poison + glucose bait began to refuse to eat glucose brings up the question of whether this aversion behavior is learned or whether it originated as a genetic mutation that became more common in the population over generations.

To answer this question, you can make use of some simple genetic crosses to look for predicted inheritance patterns. Only genetic traits, rather than learned behaviors, would be expected to show the predicted patterns. First, you need to find two populations of pure-breeding cockroaches:

• one population that has been exposed to poison + glucose bait and exhibits the glucose-aversion behavior
• one population that has not been exposed to poison + glucose bait and does not refuse to eat glucose (wild-type)
Next you perform a hybrid cross in which you mate together members from each of the two populations to create F1 offspring.
Match the labels to complete each prediction (letters) so that it supports its hypothesis (numbers). Labels may be used once, more than once, or not at all.

A. Will have a intermediate trait

B. Will refuse glucose

C. Have a mix of traits depending on experience

D. Will accwpt glucose

1. Glucose aversion is a genetically-determined recessive trait

2. Glucose aversion is a genetically-determined dominant trait

3. Glucose aversion is a genetically-determined incompletely dominant traitselect

4. Glucose aversion is a learned behavior

Answer 1

A. Will have a intermediate trait 3. Glucose aversion is a genetically-determined incompletely dominant trait

B. Will refuse glucose 2. Glucose aversion is a genetically-determined dominant trait

C. Have a mix of traits depending on experience 4. Glucose aversion is a learned behavior

D. Will accept glucose 1. Glucose aversion is a genetically-determined recessive trait

Step-by-step explanation:

A. Will have a intermediate trait 3. Glucose aversion is a genetically-determined incompletely dominant trait

When an intermediate genotype appears in the resulting offspring from a cross carried out between two set of populations where one population exhibits the glucose-aversion behavior and the other one does not refuse to eat glucose, then it is clear that neither of the two traits were dominant

B. Will refuse glucose 2. Glucose aversion is a genetically-determined dominant trait

When a trait is dominant , it will express itself irrespective of the nature of the pairing allele.

C. Have a mix of traits depending on experience 4. Glucose aversion is a learned behavior

When any trait with in an species appears with the passage of time by frequent and continuous exposure to the similar scenarios, then an induced characteristic is expressed which is appraised by learning behaviour of genes

D. Will accept glucose 1. Glucose aversion is a genetically-determined recessive trait

Here, the Glucose aversion trait is not expressed and hence it is a recessive trait.

Answer 2

The correct answer is:

A. Will have a intermediate trait 3. Glucose aversion is a genetically-determined incompletely dominant trait

B. Will refuse glucose 2. Glucose aversion is a genetically-determined dominant trait

C. Have a mix of traits depending on experience 4. Glucose aversion is a learned behavior

D. Will accept glucose 1. Glucose aversion is a genetically-determined recessive trait

If we put it simple and say that for example glucose aversion is genetically determinated, with the genotype AA and eating glucose with the genotype aa. The offspring will have Aa genotype (heterozygous). Depending on which phenotype is expressed in heterozygous we can conclude whether the trait is dominant or recessive or due to earned behavior.