how are novel phenotypes produced? I was reading my genetics textbook and I read
ID: 51316 • Letter: H
Question
how are novel phenotypes produced? I was reading my genetics textbook and I read about how a read pepper can be crossed with a cream color peper and when you interbreed the F1 generation you get different color peppers that were not present at the begining. They call these novel or new phenotypes. I get that this happens because of gene interaction. Howvever i dont get how exactly genes interact to produce a hole other color. How exactly does a read pepper and a white pepper work together to make a peach colored pepper?
Explanation / Answer
these knd of results are obtained due to interaction of gene.
As in above case red pepper crossed to white pepper make peach pepper is a case of incomplete dominance in which none of dominant gene is able to produce its full effect and hence some of both character appeared in offsprings.
Mechanism: Incomplete dominance is generally caused by a quantitative effect of the number of “doses” of a wild-type allele; two doses produces most functional transcript and therefore most functional protein product; one dose produces less transcript and product, whereas zero dose has no functional transcript or product.
In cases of full dominance, in the wild-type/mutant heterozygote either half the normal amount of transcript and product is adequate for normal cell function (the gene is said to be haplosufficient), or the wild-type allele is “upregulated” to bring the concentration of transcript up to normal levels.
The type of dominance is determined by the molecular functions of the alleles of a gene and by the investigative level of analysis.
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