Using this information, postulate the role of mutant genes in their products and

Question

Using this information, postulate the role of mutant genes in their products and producing the observed phenotypes.

4. (Chapter 4 and Screencast A tropical flower has been cultivated and several true-breeding strains have been developed from the original p flowers. From a cross between a true-breeding white-flowered plant and a true-breeding red-flowered plant yields the results set out below. F1: All plum-flowered. F2: 9 plum-flowered 4 white-flowered 3 red-flowered Using this information, postulate the role of mutant genes and their products in producing the observed phenotypes. Give the general genotypic formula that defines each color class and explains the ratio obtained AND give a metabolic pathway that explains the formation of each pigment (or lack thereof

Explanation / Answer

The development and function of an organism is controlled by genes.Mutation can led to changes in the structure of an encoded protein or to a decrease or complete loss in its expression.MUTATION can be recessive or dominant.A recessive mutation is one in which both allele must be mutant in order for the mutant phenotype to be observed whereas in dominant mutation consequences are observed in heterozygous individual carrying one mutant and one normal allele.Recessive mutation alter the structure of the encoded protein,thereby altering its function.Converesly dominant mutation often lead to gain of function.For eg dominant mutation may increase the activity of a given gene product.In some cases two copies of a gene are required for normal function so that removing a single copy leads to mutant phenotype.

Genotype frequency in a population is the number of individual with a given genotype divided by total number of individuals in the population.

p2+2pq+q2=1

p2=genotype frequency of homozygotes

2pq=genotype frequency of heterozygotes

q2=genotype frequency of homozygotes

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

---

---

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