Study Guides
-
21.
Protein Structure and Genetics Help
Protein Structure Proteins function in nearly every aspect of cellular life and there can be thousands (or tens of thousands) of different proteins in a single cell. Enzymes, which catalyze most chemical reactions within a cell, are made of protein chains. Some ...
Source: McGraw-Hill Professional -
22.
Genetic Information Flow Help
Genetic Information Flow DNA serves as the main repository of genetic information within a cell. Each strand of the DNA double helix serves as a template for its own replication. This activity precedes all cell division and is thus how genetic ...
Source: McGraw-Hill Professional -
23.
Defining the Gene Help
Defining the Gene Mendel's work suggested that a gene was a discrete "factor" that controlled a given phenotype (e.g., a gene for tall vs. short pea vine growth). Although the physical nature of the gene was not understood until the ...
Source: McGraw-Hill Professional -
24.
Protein Synthesis and Genetics Help
Transcription There are two major steps in protein synthesis: transcription and translation. The first step is the transcription of DNA to an NA molecule. This process is carried out by the enzyme RNA polymerase. This enzyme attaches to the DNA at ...
Source: McGraw-Hill Professional -
25.
DNA Replication Help
DNA Replication The hydrogen bonds linking base pairs together are relatively weak bonds. During DNA replication, the two strands separate along this line of weakness in zipperlike fashion (Fig. 3-10).
Source: McGraw-Hill Professional -
26.
Mutations and DNA Repair Help
Mutations Mutations are changes in the sequence of DNA. Mutations can occur in any region of the genome; however, phenotypic changes may be observed in the organism only if a mutation occurs in the coding sequence of a gene (see Table 3-3 for ...
Source: McGraw-Hill Professional -
27.
The Biochemical Basis of Heredity Practice Problems
Review the following concepts if needed: Nucleic Acids for Genetics
Source: McGraw-Hill Professional -
28.
The Biochemical Basis of Heredity Practice Test
Review the following concepts if needed: Nucleic Acids for Genetics
Source: McGraw-Hill Professional -
29.
Genetic Interactions Help
Two-Factor Interactions The phenotype is a result of many gene products expressed in a given environment. The environment includes not only external factors such as temperature and the amount or quality of light, but also internal factors such as hormones and ...
Source: McGraw-Hill Professional -
30.
Epistatic Interactions Help
Dominant vs. Recessive Epistasis When epistasis is operative between two gene loci, the number of phenotypes appearing in the offspring from dihybrid parents will be less than four. There are six types of epistatic ratios commonly recognized, ...
Source: McGraw-Hill Professional
