Everglades National Park is a wetlands preserve on the southern tip of the U.S. state of Florida. It is made up of coastal mangroves, sawgrass marshes and pine flat woods that are home to hundreds of animal species. The water of this wetlands is polluted. So, there is a need of improving and protecting water quality.
One very effective way to reduce water pollution in the Everglades National Park is to clean the water, take out the fertilizer and build marshes that are designed to clean the water as it flows.
Answer: A
Explanation: The nervous system sends electric signals from the brain to the body to make they move. The charger is similar becuase it sends energy to your devices so they can work.
Answer:
a) Y-STR analysis
b) No, but it can rule out if he did <em>not</em>
c) Because his daughter cannot pass a Y chromosome on
d) mitochondrial DNA analysis
Explanation:
a) Because they are tracing male lineage, they are likely carrying out Y STR analysis, which looks at short tandem repeats (STRs) on the Y chromosome. Because the Y chromosome doesn't participate in crossing over, it can be reliably traced back generations and trace the paternal line, because it undergoes very little changes over time.
b) Y-STR analysis is not the best for narrowing complete specificity to one person. The Y chromosome is highly unchanged throughout generations, so it is difficult to determine differences between closely related males. However, it can rule out paternity if the Y-STRs between tested males do not match
c) Only his daughter went on to produce direct descendants still alive today. Because she is female, she could not have harbored the Jefferson Y chromosome, any of her male children will have the Y chromosome of <em>their </em>father. Therefore, they have to look at a male elsewhere in the Jefferson family to match the Y chromosomes, hence the paternal uncle.
d) Mitochondrial DNA is often used to trace maternal ancestry. Mitochondria are organelles in the cell that possess a small amount of DNA. This DNA is passed on through the maternal line (because when the sperm and egg fuse during fertilisation, the egg has thousands more mitochondria in the cell, and therefore contributes thousands of times more mtDNA than the sperm).
Chromosome are thread-like structure of DNA and protein found in the nucleus of living cells. They carry the genetic material.
Chromosome cross over occurs between prophase 1 and metaphase1 of cell division during meosis. It is the process in which homologous chromosomes pair up with each other and exchange different portion of their genetic material thereby forming recombinant chromosomes.
As the cell division progresses, the pair of homologous chromosomes are divided in half to form haploid cells. This random process is called assortment.
Mutation occurs when there is any form of alteration in the genetic sequence of a chromosome. During cell division, chromosomal mutation can occur. It can be in form of insertion, duplication, deletion or inversion.
The answer is B - experimental group .
