<span>A person must inherit two copies of a defective CF gene -- one copy from each parent -- to have the disease. People who inherit only one copy are considered CF carriers and do not have the disease, but they can pass their copy of the defective gene on to their children.</span>
Answer:
The correct answer is option E) "The presence of one or more introns".
Explanation:
Introns are non coding sequences located within genetic sequences that are removed during RNA maturation by a process known as RNA splicing. A gene that has 2000 nucleotide pairs but is translated into a mRNA molecule with 1200 nucleotides most likely have one or more introns that in conjunction are of 800 nucleotides in size. Once the intros are removed from the mRNA molecule the coding sequence is ready to be translated into a protein.
I searched for the image and it points out to the liver. According to the choices, the answer is "converting toxins to less toxic forms" as the liver functions to detoxify substances through its cells (particularly in the smooth endoplasmic reticulum) via the cytochrome p450 system. Detoxification involves 2 phases, first is Phase I wherein the p450 system makes the toxic substance more hydrophilic (it means it is easily soluble to water) and can be readily excreted by the kidneys. If Phase I is insufficient, then the toxin enters Phase II which is conjugation with other molecules to make the toxin even more hydrophilic. The liver does not produce urine and excreting salt and urea as this is the function of the kidneys. The liver's main function is not digesting foods and liquids as that is the main function of the gastrointestinal tract, but the liver aids in the absorption of fats by the secretion of bile, thereby emulsifying the fats rendering it ready for absorption.
The DNA of cytoplasmic organelles is achieved in a non-Mendelian fashion. It is widely believed that in the cells of most animals, mtDNA is obtained solely from the mitochondria of the oocyte from which the animal originates.
<h3>Explanation:</h3>
The mitochondrion is an organelle that has its own DNA (mtDNA). Mitochondria play crucial roles in energy creation and in various cellular systems such as metabolism and signal transduction. Non-Mendelian heritage is a general term that applies to any pattern of inheritance in which traits do not separate in accordance with Mendel's laws. These laws represent the legacy of traits associated with single genes on chromosomes in the nucleus.
