The Tay-Sachs allele codes for an abnormal protein that is needed to breakdown l

Question

The Tay-Sachs allele codes for an abnormal protein that is needed to breakdown lipids in the

brain. This is a recessive trait. At each biological level explain the relationship between

dominance and phenotype in the following genotypes. State whether the phenotype is

recessive, dominant, codominant or incompletely dominant:

a. tt at the organismal level _______________

b. Tt at the biochemical level _________________

c. Tt at the molecular level ________________

d. TT at all levels _______________

Explanation / Answer

Given that, the trait is recessive, means the organism has to carry two alleles to exhibit the trait. If one recessive and one dominant traits arepresent, the recessive trait will be dominated by dominant trait and fails to express its phenotype.

a. tt at the organismal level ______Homozygous Recessive (abnormal protein will be synthesised).

b. Tt at the biochemical level ______Heterozygous dominant (phenotypically normal)___________

c. Tt at the molecular level ___Heterozygous dominant (One dominsnt and one recessive allele are present, but the expression of recessive allele is suppressed by dominant allele)__

d. TT at all levels __Homozygous dominant (phenotypically and genotypically normal at all levels)__

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.