A man whose father was colour blind marries a woman, who had a colourblind mother and normal father. What percentage of male children of this couple will be colourblind.
25%
0%
50%
50%
C.
50%
As colour blindness is an autosomal recessive genetic disorder, for it is present at X -chromosome. Thus, according to the situation given in the question, a man whose father was colour blind (will be, i.e, XY normal) marries a woman whose mother was colour blind and father was normal (i.e, this woman will be a carrier) according to the cross given below.
Thus, when marriage will happen between a normal man and a carrier woman, in that case, percentage of a male child to be colour blind is 25% (this can be easily observed from the cross given below)
At which stage of HIV infection does one usually show symptoms of AIDS?
Within 15 days of sexual contact with an infected person
When the infected retro virus enters host cells
When HIV damages large number of helper T-Lymphocytes
When HIV damages large number of helper T-Lymphocytes
What gases are produced in anaerobic sludge digesters?
Methane and CO2 only
Methane hydrogen sulphide and CO2
Methane, hydrogen sulphide and O2
Methane, hydrogen sulphide and O2
Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousand of migratory birds from Siberia and other extremely cold Northern regions move to
Western Ghat
Meghalaya
Corbett National Park
Corbett National Park
Select the correct option.
Direction of RNA Synthesis |
Direction of reading of the template DNA strand |
5’-3’ |
3’-5’ |
Direction of RNA Synthesis |
Direction of reading of the template DNA strand |
3’-5' |
5’-3' |
Direction of RNA Synthesis |
Direction of reading of the template DNA strand |
5’-3’ |
5’-3' |
Direction of RNA Synthesis |
Direction of reading of the template DNA strand |
5’-3’ |
5’-3' |
Which is the particular type of drug that is obtained from the plant whose one flowering branch is shown below?
Hallucinogen
Depressant
Stimulant
Stimulant
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.
A |
B |
C |
D |
Rock Minerals |
Detritus |
Litter fall |
Producers |
A |
B |
C |
D |
Litter fall |
Producers | Rock minerals |
Detritus |
A |
B |
C |
D |
Detritus |
Rock minerals | Producer |
Litter fall
|
A |
B |
C |
D |
Detritus |
Rock minerals | Producer |
Litter fall
|
Given below is the representation of the extent of global diversity of invertebrates. What groups the four portions (A - D) represent respectively?
A |
B |
C |
D |
Insects |
Crustaceans |
other animal group |
Molluscs
|
A |
B |
C |
D |
Crustacean |
Insects | Molluscs | other animal groups |
A |
B |
C |
D |
Molluscs |
Other animal groups | Crustaceans | Insects |
A |
B |
C |
D |
Molluscs |
Other animal groups | Crustaceans | Insects |
A scrubber in the exhaust of a chemical industrial plant removes
Gases like sulphur dioxide
Particulate matter of the size 5 micrometre or above
Gases like ozone and methane
Gases like ozone and methane
If 20 J of energy is trapped at the producer level, then how much energy will be available to peacock as food in the following chain?
Plant--> Mice --> Snake --> Peacock
0.02 J
0.002 J
0.2 J
0.2 J