The incidence of Tay-Sachs disease has been reduced by 75% since the introduction of genetic screening in 1969. Which of the following is NOT an important component of this reduction in incidence of Tay- Sachs disease?
a. genetic counseling
b. the fact that Tay-Sachs is caused by a dominant allele
c. testing of embryos after fertilization
d. birth control
e. All of the above are important components of the reduction in incidence of Tay-Sachs disease.
Ans: b. the fact that Tay-Sachs is caused by a dominant allele
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The Carboniferous Period is known for
A. The formation of rich coal deposits. B. The first examples of terrestrial gymnosperms. C. The appearance of the first angiosperms. D. A rapid increase in the diversity of marine invertebrates. E. The appearance of the first true mammals.
Which of the following descriptions of Mendel is
INCORRECT? a. He was simply lucky to work out the laws of genetics. b. He focused on contrasting phenotypic characteristics. c. He demonstrated that the blending theory of inheritance was wrong. d. He kept exact mathematical data and was one of the first scientists to analyze results numerically. e. He was a monk, a science teacher, and a plant breeder.
The latency period of syphilis is ________.
A. 20 years or longer B. 10 years C. 3 to 6 months D. 1 year
Four of the five events listed below are related to
pairing of chromosomes. Select the exception. a. pairing of homologues b. crossing over c. exchange of genes d. tight aligning of homologues e. segregation of chromosomes during anaphase I