Biology
Biology, 22.07.2019 13:50, winterblanco

Which of these is an example of environmental effect on phenotype

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Biology, 31.07.2019 07:00, ladnerhailey16
What is incomplete penetrance and what causes it? incomplete penetrance means the heterozygote has an intermediate phenotype between the two homozygous phenotypes because of interactions with environmental factors. incomplete penetrance occurs in individuals where the genotype does not produce the expected phenotype because of interactions with environmental factors or the genetic background of the individual. incomplete penetrance occurs when dominant alleles remain rare in a population because the dominant phenotype confers some disadvantages in survival and reproduction. incomplete penetrance is the failure of a dominant allele to produce a dominant phenotype because it is partially blocked by another codominant allele in a heterozygote. incomplete penetrance is when a heterozygote shows a mosaic phenotype, with some parts of the body showing the recessive phenotype, because the dominant allele is inactivated in some cells?
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Biology, 02.08.2019 03:10, Savtheartist23
Environmental variation: a. affects genotypic expression of characters. b. has no effect on phenotype. c. tends to blur together the phenotypes associated with different genotypes. d. does not direct selection.
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Biology, 06.08.2019 20:20, richaeviney
What would be required to prove that a phenotype is caused by an epigenetic change? a-the phenotype must be heritable with modified chromatin and an unaltered nucleotide sequence.b-the phenotype must be unexplained by known genetic mechanisms.c-the phenotype must be the result of a nucleotide change that is present in one gender but not the other.d-the phenotype must be passed to progeny only through the maternal dna.e-the phenotype must be reversible in the presence of mutagenic compounds.
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Biology, 27.09.2019 06:00, justhereforanswers13
which statement concerning polygenic traits is not true? a. the most frequently discussed are skin, hair, and eye color. b. their expression is often influenced by genetic/environmental interactions. c. the alleles have an additive effect on the phenotype, intensifying the genes. d. they are continuous traits. e. they are governed by more than one genetic locus.
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