Adaptive genes are selected and passed from generation to generation.
<h3>Natural selection and the evolution of long necks in giraffes</h3>
According to Darwin's theory of natural selection, natural selection selects for adaptive genes in organisms and deselects non-adaptive genes.
Thus, adaptive genes are passed from generation to generation.
In the case of the giraffes. It is plausible that their ancestors kept on stretching their necks in order to feed as the trees they fed on kept growing taller. The taller the tree grows, the longer the ancestors of giraffes stretched their necks to reach it. Otherwise, they just might have to die of starvation.
This adaptation activated the long-neck genes in the ancestors of giraffes. Natural selection selects this trait and it was passed down across generations.
More on natural selection can be found here: brainly.com/question/9830102
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The homologous chromosomes are passed on to one haploid cell. <span>The benefit is that one haploid cell get the majority of nutrients.</span>
The correct answers A false
Answer:
As the cell ages the volume of cytoplasm increases, enzymes that synthesize DNA move from the nucleus to the cytoplasm, and there is a gradual build up of lipofuscin. While it is unclear how this directly affects the cell, it is known that once the DNA migrates from the nucleus it is unable to synthesizes enzymes.
Explanation:
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Gastric secretion begins during the cephalic stage and ends during the intestinal phase. The regulation of stomach secretion is divided into three phases which are cephalic, gastric and intestinal. The cephalic stage occurs when the food is been eaten. Gastric secretions are stimulated by three chemicals which are acetylcholine, histamine and gastrin. The gastric phase occurs in the stomach while the intestinal phase occurs in the small intestines.<span />
