In guinea-pigs, the allele for black fur (B) is dominant to the allele for brown fur (b). A breeder can sell a brown guinea-pig for more money than a black guinea-pig. Which cross will produce the most money?

The genotype for the height of an organism is written as Tt. What conclusion may be drawn?

In a large family, half the children were blood group A and half were blood group B. If the father was blood group O…

How many chromosomes are there in a zygote which develops into a baby with Down's syndrome?

Which substances are present in breast milk but not in bottled milk made from milk powder?

What are found in plant cells but not in animal cells? 1 cell membrane 2 nucleus 3 cell wall 4 chloroplast

Which statement is always correct when oxygen is diffusing out of a plant cell?