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TLS Online TPP Program

#Question id: 4822

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?

#Unit 8. Inheritance Biology

  1. The genes for hair color and the genes for eyecolor are carried on different chromosomes

  2. The expected results did not take genetic recombination into account

  3. The genes for hair color and eye color are linked

  4. The genes for hair color and eye color show dependent assort

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TLS Online TPP Program

#Question id: 31387

#Unit 5. Developmental Biology

A sheet of cells that grows anteriorly from Koller’s sickle combines with the primary hypoblast to form the complete hypoblast layer is termed as:
TLS Online TPP Program

#Question id: 31408

#Unit 5. Developmental Biology

The Drosophila Sex-lethal (Sxl) gene is activated in females, but the Sxl protein does not form in males because of: 
TLS Online TPP Program

#Question id: 6992

#Unit 5. Developmental Biology

Epimorphosis is regeneration through:
TLS Online TPP Program

#Question id: 25684

#Unit 5. Developmental Biology

Following statements  were  made regarding regeneration in different organisms:
A. The regenerating blastema cells in amphibians retain their specification even when they dedifferentiate.
B. A transgenic Hydra when made to misexpress B-catenin will show nun1erous ectopic tentacles.
C. In Planaria, if the Wnt pathway is activated, then the posterior blastema would regenerate a head.
D. A regenerating blastema is formd in the mammalian liver.
Which one of the following options represents all correct statement
TLS Online TPP Program

#Question id: 7286

#Unit 5. Developmental Biology

Which of the floral whorls is affected in apetala 3/pistillata (ap3/pi) mutants?
TLS Online TPP Program

#Question id: 7287

#Unit 5. Developmental Biology

Following statements are regarding to the the floral quartet model and the underlying ABCDE model of organ identity determination in Arabidopsis thaliana.

A. Five floral organ identities (sepals, petals, stamens, carpels, and ovules) are specified by the formation of floral organ-specific tetrameric complexes of MADS-domain transcription factors that bind to two nearby enhancer elements, forming a DNA loop in between.

B. A complex of two class A proteins (APETALA 1) and two class E proteins  (SEPALLATA) determines petal identity.

C. A complex of one class A protein, one class E protein, and one of each of the class B proteins (APETALA 3 and PISTILLATA) determines sepal identity.

D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.

E. A complex of one class E protein, one class C protein, and one of each of the class D proteins (SHATTERPROOF and SEEDSTICK) controls ovule identity.

Which of the following combination are correct?