Crossing over is the main event in meiosis and heredity as it leads to genetic variation.
<h3>What is genetic variation?</h3>
Genetic variation is the changes that take place in the genes of individuals that can lead to the formation of new characters.
it generally occurs in meiosis specifically during crossing over.
Thus, it can be concluded that crossing over between non-sister chromatids during meiosis is significant in heredity as it leads to genetic variation.
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It is estimated that around 200 species are exticnt everyday- source from un environment , 2010
In this question, we will understand the air path from entering the nasal passages to reaching the alveoli, where gas exchange takes place.
<h3>What is the air's path to the lungs?</h3>
The air penetrates through the nasal passages, passes through the pharynx, larynx and trachea, bronchi, reaching the lungs where it travels through the bronchioles until reaching the alveoli, where gas exchange takes place. The difference between inspired and expired air is in the concentration of oxygen and carbon dioxide.
a) Blood leaving the air sacs is rich in oxygen gas.
b) When exhaling, the breath is rich in carbon dioxide.
c) If you trace the path of air moving through the respiratory system, it would enter through the mouth and nose. It continues through the pharynx, into the larynx, through the tubes and into the trachea and finally reaches the lungs.
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After the transcription of the DNA is complete, the genes encoding the amino acids for the proteins are copied onto the mRNA strand. After this, this RNA strand moves out of the nucleus. The ribosomes attaches the mRNA strand to itself and the tRNA reads the codon and brings the amino acid to the ribosome and attaches it. This process is continued till the protein is formed. This process is known as translation.
Hence, translation should be shown to complete the protein synthesis model.
