Imagine You Do a Test Cross Between a Purple-Flowered Pea

question 66

Multiple Choice

Imagine you do a test cross between a purple-flowered pea plant having serrated leaves (a dominant trait) and a white-flowered pea plant having smooth edges. If the purple-flowered plant is heterozygous for both traits, the expected ratio in the offspring is 1 purple-serrated:1 purple-smooth:1 white-serrated:1 white-smooth. Instead, you see 4 purple-serrated:1 purple-smooth:1 white-serrated:4 white-smooth. What is the explanation of this ratio?

• A)There is incomplete dominance.
• B)The genes are linked.
• C)The genes are linked and there is incomplete dominance.
• D)There has been a mutation during the cross.

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Definitions:

Prefrontal Cortex

The front part of the frontal lobes of the brain, involved in complex behaviors including planning, personality expression, decision making, and moderating social behaviour.

Limbic System

An elaborate neural framework and circuits within the brain, positioned near the cortex's edge, that are key in controlling natural impulses and mood fluctuations. It oversees essential emotions like anger, joy, and fear, in addition to primal needs such as the pursuit of food, sexual satisfaction, power, and offspring care.

Medial Temporal Lobes

A critical region of the brain involved in the formation of new memories, spatial navigation, and the integration of sensory information.

Sensation

The process by which sensory receptors and the nervous system receive and represent stimuli from the environment.