please answer questions 6-8 Unattached earlobes are a dominant trait. If A denot

Question

please answer questions 6-8 Unattached earlobes are a dominant trait. If A denotes the allele for unattached earlobes, and a denotes the allele for attached earlobes, what is (are) the possible genotype(s) of a person who has unattached earlobes? Could both parents of a person with unattached earlobes have attached earlobes? Why or why not? Think about what the parent's genotypes have to be. How are a locus, allele and a gene similar? How would you differentiate among these three terms? Explain what is meant by polygenic inheritance, pleiotropy, and human gene therapy. Provide an example of each.

Explanation / Answer

6. The possible genotypes of this dominant trait will be:

AA (homozygous)

Aa (heterozygous)

Since a person with unattached earlobes will either be: AA or Aa if both parents have attached ear lobes their genotypes have to be: aa and aa; as this is a recessive trait expressed only in homozygous condition, thus with such a parentage the offsprings will not have the dominant trait A. Hence this is not possible.

7. Locus is the position of a gene which is a unit of hereditary material coding for a trait that is passed on from parents to offsprings and allele is the alternate forms of a gene. Thus they all are related to each other.

8. Polygenic inheritance is the phenomenon of coding of a trait by many genes like the color of the skin.

Pleiotropy is the phenomenon of a single gene influencing many unrelated traits phenotypically e.g. is phenylketonuria

Gene therapy involves usage of genes prevent or treat diseases e.g. is using the molecular biology techniques to knockout mutated nonfunctional genes and replacing a functional gene by knocking.   

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