In a hypothetical diploid organism, “squareness” of a cell is due to a threshold

Question

In a hypothetical diploid organism, “squareness” of a cell is due to a threshold effect (gene product levels are important): more than 60 activity units of "square factor" per cell produces a “square” phenotype while less than 60 activity units produces a “round” phenotype. square (s) is a gene that controls the synthesis of square factor. The most common allele found in nature is sc. This allele contributes 50 units of square factor, thus, sc homozygotes have 100 units and are phenotypically square. sn is a null allele (no functional gene product made). sn homozygotes are phenotypically round. A final mutant allele, sh, contributes 70 units of square factor. Sh homozygotes have 140 units and are phenotypically square.

The Sc allele is also known as the ________________ allele (insert term).

Recall the Sn is a null allele. How many activity units of square factor is made within Sn homozygotes. _______________

Describe the expected dominance relationship between sc and sn alleles? Explain your answer. In your explanation, use ALL the terms listed on the next page that apply.

Describe the dominance relationship between, sh and sn alleles? Explain your answer. In your explanation, use ALL the terms listed below that apply.

                        recessive                                  haploinsufficinet

                        dominant                                 haplosufficient           

                        semidominant                          codominant

Explanation / Answer

Square phenotype is produced when gene product activity is more than 60 activity units and less than 60 activity units show recessive allele. Here complete dominance is observed.

1.The Sc allele is also known as the Wild type allele.

2. Sn is a null allele and are phenotypically round. A null allele with haplosufficient genes produce recessive allele. The activity units of square factor is made within Snhomozygotes is 0. (Homozygous mutant sn x sn produce non functional gene product)

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