Biology
Frequent use of antibiotic kills many bacteria, creating a selection pressure. As a result, bacteria with mutations that give them resistance to a particular antibiotic have an advantage over the other bacteria that do not. They survive to reproduce more than the other types, and pass on this advantageous allele in greater numbers. The frequency of this allele therefore increases in subsequent generations, leading to an increase in frequency of resistant types in subsequent generations. As bacteria have a haploid genome, this alleles will be expressed and there will be no masking of any recessive alleles. In addition, bacteria multiply rapidly as they reproduce asexually by forming clones.
- Mendelian Genetics Part No. 1 - Defining Key Vocabulary
Solving Mendelian genetics problems can seem somewhat daunting from the onset, especially with the vocabulary that is associated with them. Here we will define key terms that are used in genetics problems, but also, walk you through the proper steps needed...
- A Locus May Have Many Different Mutant Alleles
KEY TERMS:A locus is said to have multiple alleles when more than two allelic forms have been found. Each allele may cause a different phenotype. KEY CONCEPTS: The existence of multiple alleles allows heterozygotes to occur representing any pairwise...
- Evolution Part 3 - Natural Selection
EVOLUTION PART 3 ? NATURAL SELECTIONMs. Carter MUTATIONS are changes in our DNA. Sometimes, mutations are harmful and cause death. Other times, mutations give the individual an advantage and allow these individual to survive certain environmental conditions...
- # 54.2 Infectious Disease - Syllabus 2016
10.1 Infectious diseases 10.2 Antibiotics The infectious diseases studied in this section are caused by pathogens that are transmitted from one human host to another. Some, like Plasmodium that causes malaria, are transmitted...
- Prokaryote: Cells
In this picture are millions and millions of bacteria. No matter how much I clean the countertops, once an object or hand is placed on it, more bacteria live there. Bacteria is a prokaryote which are cells that do not have a nucleus or membrane bound...
Biology
Q: Explain why mutations for antibiotic resistance spread so rapidly among bacteria
Frequent use of antibiotic kills many bacteria, creating a selection pressure. As a result, bacteria with mutations that give them resistance to a particular antibiotic have an advantage over the other bacteria that do not. They survive to reproduce more than the other types, and pass on this advantageous allele in greater numbers. The frequency of this allele therefore increases in subsequent generations, leading to an increase in frequency of resistant types in subsequent generations. As bacteria have a haploid genome, this alleles will be expressed and there will be no masking of any recessive alleles. In addition, bacteria multiply rapidly as they reproduce asexually by forming clones.
- Mendelian Genetics Part No. 1 - Defining Key Vocabulary
Solving Mendelian genetics problems can seem somewhat daunting from the onset, especially with the vocabulary that is associated with them. Here we will define key terms that are used in genetics problems, but also, walk you through the proper steps needed...
- A Locus May Have Many Different Mutant Alleles
KEY TERMS:A locus is said to have multiple alleles when more than two allelic forms have been found. Each allele may cause a different phenotype. KEY CONCEPTS: The existence of multiple alleles allows heterozygotes to occur representing any pairwise...
- Evolution Part 3 - Natural Selection
EVOLUTION PART 3 ? NATURAL SELECTIONMs. Carter MUTATIONS are changes in our DNA. Sometimes, mutations are harmful and cause death. Other times, mutations give the individual an advantage and allow these individual to survive certain environmental conditions...
- # 54.2 Infectious Disease - Syllabus 2016
10.1 Infectious diseases 10.2 Antibiotics The infectious diseases studied in this section are caused by pathogens that are transmitted from one human host to another. Some, like Plasmodium that causes malaria, are transmitted...
- Prokaryote: Cells
In this picture are millions and millions of bacteria. No matter how much I clean the countertops, once an object or hand is placed on it, more bacteria live there. Bacteria is a prokaryote which are cells that do not have a nucleus or membrane bound...