Determine whether each of the following statements about heritability is true or
ID: 274036 • Letter: D
Question
Determine whether each of the following statements about heritability is true or false 1. If a trait is determined entirely by genes, not by the environment, then the heritability of the trait is O. (Click to select) 2. Heritability is defined as the proportion of the phenotypic variance for a trait that is due to genetic differences in a population at a certain time. (Click to select 3. The heritability of a single-gene trait is always 1.0(Cick to select) 4. The heritability of a trait changes when the environment changes. (Click to select) 5. If the heritability of a trait is very high, then all siblings will have the same phenotype. (Cick toseloct) 6. Genetic variance for a polygenic trait is due mainly to the additive effects of dominant alleles of different genes. (Click to select)Explanation / Answer
1
1. False. Heritability of the trait will be 1, as no heritability will be dependent only on genes then.
2. True, if one does not involve environmental factors. But if one includes environmental factors, phenotype depends on genetics+environment+epigenetics as well.
3. True as there are no other gene that influences the phenotype apart from a single gene
4. True as phenotype depends on genetics as well as environmental factors.
5. True as the genes will be passed onto the next generation. Environmental factors could lead to changes in future.
6. True as dominant alleles combination are the ones that determines the phenotype.
2. aabbcc aaBbcc AabbCc aa-Bb-CC AaBBCc AaBBCC AABBCC (from lighterst to darkest skin color order)
3.
1. Genes alone as Down syndrom affects Palm ridges as well
2. Environmental
3. Basically genetic but environment also plays small role.
4. Genes and environment
5. genetic and environmental
6. environmental
7. environmental
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