100% tall 0% dwarf
75% tall 25% dwarf
50% tall 50% dwarf
25% tall 75% dwarf
Correct answer is C
A heterozygous tall plant (say Tt) crossed with pure-breeding dwarf plants (tt) will give a set of Tt, Tt, tt and tt. This is 50% tall and 50% dwarf approximately.
Which of the following traits in humans can be affected by environmental factors?
skin colour
eye colour
baldness
tongue-rolling
Correct answer is A
No explanation has been provided for this answer.
What will be the genotypic ratio when two heterozygous red pea plants are crossed?
1 : 0
1 : 2 : 1
2 : 1
3 : 1
Correct answer is B
No explanation has been provided for this answer.
In man, sex is determined by the inheritance of
a pair of homologous chromosomes
an extra chromosome in the cells of a female
a dominant gene for maleness present in man
two similar X chromosomes in the female and X and Y chromosomes in the male
Correct answer is D
No explanation has been provided for this answer.
The ability of some individuals to taste phenylthiocarbamide (PTC) is a
morphological adaptation
morphological variation
physiological adaptation
physiological variation
Correct answer is D
No explanation has been provided for this answer.