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.
Which of these physiological variations is sex-linked?
albinism
blood groups
sickle-cell anaemia
haemophilic condition
Correct answer is D
No explanation has been provided for this answer.