An insect with a mandibulate mouth part will obtain its food by
biting and chewing
chewing and sucking
chewing
sucking
Correct answer is A
No explanation has been provided for this answer.
The type of reproduction that leads to variation in animal and plant populations is
budding
sexual
vegetative
asexual
Correct answer is B
No explanation has been provided for this answer.
A feature associated with the Y-chromosome in humans is
long eyelashes
prominent fingernails
facial hairs
enlarged breast
Correct answer is C
No explanation has been provided for this answer.
An organism that has been extensively used to test the chromosomes theory of heredity is
Drosophila melanogaster
Muscar domestica
Zea mays
Homo sapiens
Correct answer is A
No explanation has been provided for this answer.
75%
50%
25%
100%
Correct answer is A
A heterozygote for sickle-cell anaemia = AS
Crossing two AS persons, we have one AA, two AS, and one SS.
∴ The probability that the children are either carriers or sicklers = ¾
= 75%