Genes that control coat color in mammals represent some of the best early examples of genes with multiple alleles exhibiting different phenotypes. A classic example is the C gene in hamsters. Three of the known alleles of this gene are C, c^k and c^a. Each supplies a different amount of black pigment to the coat hair. The phenotypes of three different homozygous strains are as follows.

Based on the concepts of dominance, determine whether ck and ca were dominant or recessive alleles by crossing the true-breeding sepia hamsters to true-breeding black hamsters. From the resulting F1 progeny phenotype, what would be the ratio of F2 phenotype

TLS Online TPP Program

#Question id: 8716

#Unit 9. Diversity of Life Forms

The most important feature that permits a gene to act as a molecular clock is ________.

TLS Online TPP Program

#Question id: 4297

#Unit 3. Fundamental Processes

Match the following decay mechanism

A. Matured translation	1. Ribosome displaces all of the exon–junction complexes.
B. nonsense-mediated mRNA decay	2. Upf complex
C. nonstop-mediated decay	3. eRF1 and eRF3
D. no-go decay

TLS Online TPP Program

#Question id: 31161

#Unit 7. System Physiology – Animal

During the action potential, membrane potential moves toward the equilibrium potential for Na⁺ but does not reach it because: 

TLS Online TPP Program

#Question id: 12155

#Unit 10. Ecological Principles

Under which of the following conditions do the mathematical models for competition tell us that coexistence of two competing species is most likely? 

TLS Online TPP Program

#Question id: 13027

#Unit 13. Methods in Biology

Which of the following genes in the T-DNA doesn’t help in the proliferation of the crown gall disease in the plants mediated by Agrobacterium ?