Answer:
The given statement is true.
Explanation:
Genome is not a steady entity, it is exposed to various kinds of heritable modifications, a sudden and heritable modification in the arrangement of the genome in an organism, which produces different forms of any gene is called mutation.
The mutations provide the raw material for genetic evolution, mutation leads to the generation of alleles, in the absence of mutation all the genes would prevail only in one form, and the organism would lose to the tendency to evolve and amend with the changing environments.
Answer:
Relaxation of the dartos muscle.
Explanation:
Testes are present in scrotum outside the pelvic cavity to maintain the temperature about 2-3 degrees Celsius below the body temperature as required for sperm production. Dartos muscle is the layer of smooth muscle located in the superficial fascia. The contraction of dartos muscle serves to make the skin of the scrotum wrinkled and tight.
During hot weather, the dartos muscle relaxes and makes the surface of scrotum less wrinkled to increase the loss of the heat from its surface. The increased heat loss from the surface of scrotum due to relaxed dartos muscles keeps the testes protected from heat.
Answer and Explanation:
There are three basic steps as initiation, extension and termination which occur in both eukaryotes and prokaryotes. For transcription of a gene to occur, the DNA double helix unwinds over a short region.
initiation: RNA polymerase enzyme is linked to specific portions called as promoter in DNA to start RNA synthesis after the DNA unwinds.
Elongation: the enzyme synthesizes RNA strand along the DNA chain.
Termination: RNA synthesis continues along the DNA strand until it encounters a signal representing termination of the process. The termination process happens as the transcription complex separation takes place on the DNA sequence.
When assembled in the nucleus,mRNA peels off and moves to the cytoplasm. Here, it attaches to the ribosomes.Protein synthesis is started with AUG codon which is at the beginning of the mRNA-carried code. As the mRNA moves along the ribosome its information is translated into the appropriate amino acids which are assembled into a polypeptide. this is called translaton.
Answer:
Explanation:
1. what goes up, must come down
2. every action equal and opposite reaction
3. force equals mass time acceleration
D. Disruptive selection
Because that splits the normal distribution into 2 separate distributions, like dividing a normal curve into 2 new extremes.