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TLS Online TPP Program

#Question id: 7297

How is the ABC model for floral identity in Arabidopsis similar to the models for homeotic gene function derived from studies in Drosophila?

#Unit 5. Developmental Biology
  1. The key resposnsibility of homeotic genes in both is patterning of dorsal-ventral asymmetry.
  2. In both organisms, one homeotic gene is expressed at the two ends, a second expressed in to domains more central to that of the first and a third expressed more centrally, thus contributing unambiguous identities to all regions of the organism.
  3. In both organisms, homeotic genes interact, so that it is often the combination of genes present that is critical in specifying structure in adult.

  4. The ABC model of Arabidopsis is essentially identical to the Drosophila model for homeotic gene function, in that the Drosophila version of the A gene is abdominal-A, the Drosophila version of the B gene is Abdominal-B, and the Drosophila version of the C gene is Ultrabithorax.

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TLS Online TPP Program

#Question id: 4821

#Unit 8. Inheritance Biology

What are frequency of recombination  if one cell carry out cross over every 50 cell undergoes meiosis ?
TLS Online TPP Program

#Question id: 4822

#Unit 8. Inheritance Biology

In a particular species of mammal black hair (B) is dominant to green hair (b) and red eyes (R) are dominant to white eyes (r). If a BbRr individual is mated with a bbrrindividual the expected phenotypic ratio of the offspring is 1 black-red : 1 black-white: 1 green-red : 1 green-white. However, when you mate these individuals you find that the phenotypic ratio of the offspring is 6 black-red :1 black-white : 1 green-red : 6 green-white. What could account for this difference?
TLS Online TPP Program

#Question id: 4823

#Unit 8. Inheritance Biology

Which one of the following DNA markers can be used to distinguish between a homozygote and heterozygote ?
TLS Online TPP Program

#Question id: 4824

#Unit 8. Inheritance Biology

If plant with genotype AaBb is test cross where A and B are link at 10 map unit  in trance configuration then the probability of getting AaBB and AaBb genotype respectively?
TLS Online TPP Program

#Question id: 4825

#Unit 8. Inheritance Biology

How many genetically different gametes can be made by an individual of genotype AaBbCcDd if gene A, B are completely link and other are unlink?
TLS Online TPP Program

#Question id: 4826

#Unit 8. Inheritance Biology

In Drosophila melanogaster, vestigial wings are determined by a recessive allele of a gene that is linked to a gene with a recessive allele that determines black body color. T. H. Morgan crossed black-bodied, normal-winged females and gray-bodied, vestigial-winged males. The F1 were all gray bodied, normal winged. The F1 females were crossed to homozygous recessive males to produce testcross progeny. Morgan calculated the map distance to be 17 map units. Which of the following information is correct about the testcross progeny?