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Svetllana [295]
3 years ago
8

In a study on the biological bases of learning, lab rat a is given a drug that blocks dopamine activity in its brain. thereafter

, the rat is placed in an operant chamber where a lever-pressing task is shaped through positive reinforcement. we should expect that the rat will have
Biology
1 answer:
Anvisha [2.4K]3 years ago
8 0
We should expect that the rat will have have more difficulty in learning the task compared to a normal rat. This is because the rat has been injected with a certain drug that oppresses the dopamine activity. And then the rat is placed in an operant chamber where a lever-pressing task is shaped through positive reinforcement. 
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Given the parents AABBCc × AabbCc, assume simple dominance for each trait and independent assortment. What proportion of the pro
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Answer:

3/4

Explanation:

If we assume simple dominance and independent assortment for each trait, we can use Mendel's Law of Segregation to predict the phenotypic proportions in the offspring of the parental cross AABBCc x AabbCc.

<h3><u>Gene A</u></h3>

AA x Aa

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<h3 /><h3><u>Gene B</u></h3>

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<h3 /><h3><u>Gene C</u></h3>

Cc x Cc

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We want to know the proportion of progeny with all dominant phenotype (A_B_C_). Since the genes are independent, we can multiply the probabilities of each gene to obtain the overall probability of having a ABC progeny:

<h3>1 A_ x 1 B_ x 3/4 C_ = 3/4 A_B_C_</h3>
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