A yellow maize is planted and all the fruits obtained are of yellow seeds. When they are cross-bred, yellow seeds and white seeds are obtained in a ratio 3:1. The yellow seed is said to be
non-heritable
sex-linked
a recessive trait
a dominant trait
When a colour-blind man marries a carrier woman. What is the probability of their offspring being colour blind?
25%
50%
75%
100%
The correct base pairing for DNA is
adenine → thymine and guanine → cytosine
adenine → guanine and thymine → cytosine
adenine → cytosine and guanine → thymine
adenine → adenine and cytosine → cytosine
The type of interaction shown is referred to as
interspecific competition
intraspecific competition
mutualism
cooperation
Which of the following statement is true of the interaction?
P aurelia is better adapted for obtaining food than P caudatum
P caudatum is better adapted for obtaining food than P. aurelia
both organisms cannot coexist
both organisms cannot reproduce
