Describe the value of using twins in the study of questions relating to the relative impact of heredity versus environment
What will be an ideal response?
Monozygotic twins are derived from the splitting of a single fertilized egg and are therefore of identical genetic makeup. When such twins are raised in the same versus different settings, an estimate of relative hereditary and environmental influences can often be made.
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Which of the following statements is FALSE?
a. Crossing over tends to reduce the frequency that two linked genes are inherited together. b. Independent assortment of homologous chromosomes during meiosis increases variation. c. Crossing over leads to variation. d. Abnormal number or structure of chromosomes may influence the course of evolution. e. The closer together genes are found on a chromosome, the greater is a chance that crossing over will occur between them
Replacement-level fertility requires a total
fertility rate of a. 2.0 b. 2.1 c. 2.4 d. 2.6 e. 2.8
The A, P, and E sites are progressively occupied by amino acids being assembled into a polypeptide. These sites are part of
A. tRNA. B. the large ribosomal subunit. C. the spliceosome. D. mRNA. E. DNA.
True or False: Lipopolysaccharide, bacterial flagellin, and lipoteichoic acids are examples of pathogen-associated molecular patterns (PAMPs)
a. TRUE b. FALSE