TLS Online TPP Program

#Question id: 3915


Which of the following is true for the unwinding of the DNA helix and the synthesis of a short stretch of RNA?

#XL - Q Biochemistry
  1. The process requires a helicase and a primase as in DNA replication.

  2. In transcription, these steps proceed via an RNA polymerase holoenzyme.

  3. The unwinding and subsequent synthesis above serve as a primer for chain elongation.

  4. All of the above

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TLS Online TPP Program

#Question id: 4751

#XL - R Botany

In the following example, 3 independently assorting genes are known to govern coat color in mice. The genotype of few of the coat colors is given below:

Agouti: A-B-C- Black: aa B-C - Albino: -- -- cc

What will be the expected frequency of abino, in progeny from crosses of  AaBbCc with albino of the genotype aabbcc?

TLS Online TPP Program

#Question id: 4752

#XL - R Botany

Red-green color blindness is caused by a sex-linked recessive allele. A color-blind man marries a woman with normal vision whose father was color-blind. What is the probability that they will have a color-blind daughter? What is the probability that their first son will be color-blind respectively?

TLS Online TPP Program

#Question id: 4753

#XL - R Botany

Pattern baldness in humans is a sex-influenced trait that is autosomes dominant in males and recessive in females. What is genotype of both parents with normal hair had one son with pattern baldness and another son is normal hair?

TLS Online TPP Program

#Question id: 4754

#XL - R Botany

Allele A is epistatic to allele B. Which of the following statement are incorrect?

TLS Online TPP Program

#Question id: 4755

#XL - R Botany

When two albino snails were crossed, all of the F1 were pigmented. All F1 intercross would results

TLS Online TPP Program

#Question id: 4757

#XL - R Botany

The newborn baby of a mother having blood group O, Rh+ and father having blood group AB, Rh-, got mixed with other babies in the hospital. The baby with which of the following blood groups is not confirmable to be of the said couple?

(i) AB, Rh+                                                    (ii) O, Rh+

(iii) A, Rh+                                         (iv)  B, Rh+