Advantages of Alternation of Generations
There are two important evolutionary advantages to the alternation of generations plant life-cycle. Firstly, by forming a haploid gametophyte, there is only one allele for any genetic trait. Thus, all alleles will be expressed because no allele may be masked by a dominant counterpart (there is no counterpart). The benefit of this is that any mutation that causes a lethal, or harmful, trait expression cannot be masked and will cause the gametophyte to die; thus, the trait cannot be passed on to future generations, preserving the strength of the gene pool. Also, crossing-over during meiosis in the formation of spores, and sexual reproduction in the gametophytes, produces genetic diversity, which also inhibits harmful recessive genes from "surfacing" and being expressed.
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Famous quotes containing the words advantages, alternation and/or generations:
“No advantages in this world are pure and unmixed.”
—David Hume (1711–1776)
“The law of nature is alternation for evermore. Each electrical state superinduces the opposite. The soul environs itself with friends, that it may enter into a grander self-acquaintance or solitude; and it goes alone for a season, that it may exalt its conversation or society.”
—Ralph Waldo Emerson (1803–1882)
“Before I had my first child, I never really looked forward in anticipation to the future. As I watched my son grow and learn, I began to imagine the world this generation of children would live in. I thought of the children they would have, and of their children. I felt connected to life both before my time and beyond it. Children are our link to future generations that we will never see.”
—Louise Hart (20th century)