Name and briefly describe some common disorders associated with recessive alleles
What will be an ideal response?
A good answer will include the following key points:
+ Albinism: skin lacks melanin, which causes visual problems and extreme sensitivity to light.
+ Cystic fibrosis: excess mucus clogs digestive and respiratory tracts.
+ Phenylketonuria (PKU): Phenylalanine, an amino acid, accumulates in the body and damages the nervous system, causing mental retardation.
+ Tay-Sachs disease: The nervous system degenerates in infancy, causing deafness, blindness, mental retardation, and, during the preschool years, death.
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A fertilized egg is called a(n)
a. amnion. c. mesoderm. b. umbilical cord. d. zygote.
When children recover from brain damage to language areas and the resultant aphasia, recovery is most likely the result of:
a. areas in the opposite hemisphere assuming the role of the damaged areas b. other areas in the same hemisphere assuming the role of the damaged areas c. growth of the both hemispheres' language areas d. refinement of both hemispheres' language areas