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TLS Online TPP Program

#Question id: 7298

In what way are the homeotic genes of flowering plants similar to those of Drosophila and other animals?

#Unit 5. Developmental Biology
  1. all homeotic genes are transcription factors of the homeobox class.
  2. the homeotic genes of flowers are derived during evolution from the same primordial genes used in animals.
  3. mutations in the homeotic genes of flowers cause transformation of one organ into another.
  4. the homeotic genes of plants are arranged in a cluster on the chromosome, and are expressed from one end to the other in an anterior-posterior order.
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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, ck and ca. 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: 15192

#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, ca and ck. 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 recessivity, determine whether ck and ca were dominant or recessive alleles by crossing the true-breeding albino hamsters  with the true-breeding sepia hamsters. From the resulting F1 progeny phenotype, what would be the ratio of F2 phenotype