RR X Rr
RR X rr
rr x rr
Rr x Rr
Correct answer is D
No explanation has been provided for this answer.
1:2:1
4:1
3:1
2:2
Correct answer is C
No explanation has been provided for this answer.
The organic molecule(s) present in the nucleus is/are
DNA
Protein, RNA, and DNA
RNA and ATP
RNA
Correct answer is B
No explanation has been provided for this answer.
Which of following pairs of scientists discovered the Rhesus factor in human blood?
Hooke and Lavine
Darwin and Landsteiner
Landsteiner and Lavine
Hooke and Darwin
Correct answer is C
No explanation has been provided for this answer.
Which of the following is an example of discontinuous variation?
the range in height of a pea plant from 30cm to 50cm
Offspring, including the two male cats and three female cats
the colour of pear plants grown in the dark
the adult body weight ranging from 50 kg to 95 kg
Correct answer is B
A characteristic of any species with only a limited number of possible values shows discontinuous variation (i.e It can only be a discrete number of values). Human blood group is an example of discontinuous variation. In the ABO blood group system, only four blood groups are possible (A, B, AB or O). There are no values in between, so this is discontinuous variation.
Here are some examples: blood group, sex (male or female), eye color, etc.