In Humans,normal Skin Pigmentation Is Influenced by a Dominant Gene

question 18

Multiple Choice

In humans,normal skin pigmentation is influenced by a dominant gene (C) ,which allows pigmentation to develop.All individuals who are homozygous for the recessive allele (c) are unable to produce an enzyme needed for melanin formation and are therefore referred to as albino.Two normal parents produce an albino child.What are the chances that the next child will be an albino?  

• A) 1/2 chance
• B) 2/3 chance
• C) 1/4 chance
• D) 1/8 chance
• E) no chance

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Definitions:

Natality

The birth rate, or the number of births within a population over a certain period of time, often expressed per 1000 individuals.

Population Crash

A sudden, sharp decrease in the size of a population due to environmental factors.

Carrying Capacity

The maximum population size of a biological species that an environment can sustain indefinitely, given the food, habitat, water, and other necessities available.

Environmental Resistance

A set of factors in an ecosystem that limits the growth of a population.