<span>Cohesin holds the sister chromatids together after DNA replication, and removal of cohesin leads to separation of the sister chromatids.
Securin is part of the metaphase-anaphase transition and anaphase onset and is required to ensure that separase is folded properly.
Since Securin must be degraded for anaphase and the subsequence degradation of cohesin to occur, it must be dephosphorylated just prior to anaphase.</span>
Answer:
All the possible alleles for a gene with multiple alleles cannot be expressed by single individual
Explanation:
Gene pool refers to the sum total of all the alleles of all the genes which are present in a population. Human beings are diploid organisms. One individual can have only two possible alleles for a gene. A gene can have two or more than two alleles. Since all the possible alleles for a gene with multiple alleles cannot be expressed by single individual, a gene pool cannot be made of one individual.
Many life forms consist of a single cell. As well as simple bacteria, there are more complex organisms, known as protoctists. Unlike bacteria, they have complex internal structures, such as nucleus containing organized strands of genetic material called chromosomes. Most are single-celled, but some form colonies, with each cell usually remaining self-sufficient. :)
The correct answer is fire extinguisher.
Before someone starts to fuel a boat there should be fire extinguisher.
When a person is fueling the fuel might overfill and spill the fuel into engine or to passenger compartment and this can increase the risk of fire explosion and if spilling fuel to the water will harm the marine environment that is why a person should have fire extinguisher when fueling.
Some precautions which are taken when refueling are,
1. Refueling should be done on daylight when artificial light is not needed.
2. When refueling a person should not smoke.
3. Portable tank should be refueled in the tank and not in the boat.