All offspring are produced in a single reproductive event, we term this pattern semelparity. Which of the following is characteristics feature for semelparity individuals?

a) Semelparity is common in insects and other invertebrates

b) Semelparous organisms may live for many years before reproducing

c) semelparity occur only in plant

d) In semelparity, exploitation competition is more common than interference competition

TLS Online TPP Program

#Question id: 15186

#Unit 13. Methods in Biology

Electrophoretic resolution is achieved by adjusting

A. Current

B. Buffer concentration

C. Chemical nature of Buffer

D. Concentration of supporting media

TLS Online TPP Program

#Question id: 15187

#Unit 13. Methods in Biology

Highest electrophoretic resolution/sensitivity is achieved from

TLS Online TPP Program

#Question id: 15188

#Unit 13. Methods in Biology

Electrophoretic mobility and Electroendosmostic force combinedly functions in

TLS Online TPP Program

#Question id: 15189

#Unit 4. Cell Communication and Cell Signaling

Which of the following  cells control the differentiation of HSCs (hematopoietic stem cells )?

TLS Online TPP Program

#Question id: 15190

#Unit 8. Inheritance Biology

The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?

TLS Online TPP Program

#Question id: 15191

#Unit 8. Inheritance Biology

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