Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
Filter By
Clear Filter

All Questions

The following is the biochemical pathway for purple pigment production in flowers of sweet pea:

Colorless precursor 1 —- Allele A—->  Colorless precursor 2 —--- Allele B—---> Purple pigment

Recessive mutation of either gene A or B leads to the formation of white flowers. A cross is made between two parents with the genotype: AaBb × aabb. Considering that the two genes are not linked, the phenotypes of the expected progenies are:

 

Option: 1

9 purple : 7 white


Option: 2

3 white : 1 purple


Option: 3

1 purple : 1 white


Option: 4

9 purple : 6 light purple : 1 white


3(white):1(purple)

In case of 'duplicate recessive epistasis homozygous recessive gene masks the other gene i.e., aa is epistatic to A or a || bb is epistatic to B or b

View Full Answer(2)
Posted by

Riya

Experimental verification of the chromosomal theroy of the inheritance was done by:
Option: 1 Mendel 
Option: 2 Sutton
Option: 3 Boveri
Option: 4 Morgan  

The experimental verification of the chromosomal theory of inheritance was done by Thomas Hunt Morgan and his colleagues which led to discovering the basis for the variation that sexual reproduction produced.

View Full Answer(1)
Posted by

Ritika Jonwal

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

If the distance between two consecutive base pairs is 0.34nm and the total number of base pairs of a DNA helix in a typical mammalian cell is 6. 6 \times 10^{5} bp, then the length of the DNA is approximate:
Option: 1 2.0 meters
Option: 2 2.5 meters
Option: 3 2.2 meters
Option: 4 2.7 meters

Length of the DNA = Distance between two base pairs x Total no. of base pairs. 

Length of the DNA = 0.34 x 6.6x105  = 2.244 

View Full Answer(1)
Posted by

Ritika Jonwal

Name the enzymes that facilitate the opening of DNA helix during transcription.
Option: 1 DNA ligase
Option: 2 DNA helicase
Option: 3 DNA polymerase
Option: 4 RNA polymerase
   

During initiation in the process of transcription, the RNA polymerase holoenzyme binds to the promoter region of the transcription unit. The RNA polymerase-sigma complex binds to the promoter and initiates transcription of a specific strand of DNA. The DNA strand unwinds by the action of this complex. 

View Full Answer(1)
Posted by

Ritika Jonwal

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Which of the following statements is correct?
Option: 1 Adenine pairs with thymine through two H-bonds
Option: 2 Adenine pairs with thymine through one H-bond
Option: 3 Adenine pairs with thymine through three H-bonds.
Option: 4 Adenine does not pair with thymine  

In double-stranded DNA, Adenine pairs with Thymine with two Hydrogen bonds that is (A=T) and Guanine pairs with Cytosine with three hydrogen bonds. 

View Full Answer(1)
Posted by

Ritika Jonwal

Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups  
Option: 1 The gene (I) has three alleles.
 
Option: 2 A person will have only two of the three alleles.
 
Option: 3 When IA and IB are present together, they express same type of sugar.
 
Option: 4 Allele "i" does not produce any sugar.

Option 4

 

View Full Answer(2)
Posted by

Simran

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Select the correct match
Option: 1  Haemophilia           -Ylinked
 
Option: 2  Phenylketonuria      - Autosomal dominant trait
Option: 3 Sickle cell anaemia   -Autosomal recessive trait chromosome 11  
Option: 4 Thalassemia          - X linked

Sickle cell anaemia - Autosomal recessive trait chromosome 11 is the correct one.

Hence, the correct option is (c). 

View Full Answer(1)
Posted by

Ritika Jonwal

From the experiments, S.I. Miller produced amino acids by mixing the following in a closed flask:
Option: 1 CH_4, H_2 ,NH_3 and water vapor at 800 Co
Option: 2 CH_3, H_2 ,NH_4 and water vapor at 800 Co
Option: 3 CH_4, H_2 ,NH_3 and water vapor at 600 Co
Option: 4 CH_3, H_2 ,NH_3 and water vapor at 600 Co

S.I. Miller produced CH_4, H_2 ,NH_3 and water vapour at 800 Co.

View Full Answer(1)
Posted by

Ritika Jonwal

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

How many true-breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits
 
Option: 1 4
 
Option: 2 2
Option: 3 14
Option: 4 8

Total 14 true-breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits.

View Full Answer(1)
Posted by

Ritika Jonwal

The first phase of translation is
 
Option: 1 Binding of mRNA to the ribosome
 
Option: 2 Recognition of DNA molecule
 
Option: 3 Aminoacylation of tRNA
 
Option: 4 Recognition of an anti-codon

The first phase of translation is an initiation in which there are the two ribosomal subunits (small and large), The mRNA to be translated, the first (formyl) aminoacyl tRNA (the tRNA charged with the first amino acid), 

Hence, the correct option is (a). 

View Full Answer(1)
Posted by

Ritika Jonwal

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE
filter_img