The primary cause of species endangerment is

What name is given to a sudden change in a gene or chromosome?

Two yellow-flowered hybrid plants each carrying a recessive factor for flowers with green colour were crossed.Which of the following ratios shows the correct proportion of offspring that have green flowers?

In a case of complete dominance, what is the phenotypic ratio of the cross Bb X Bb; where B =black and b = white?

In the structure of DNA, which of the following statements is true?

Two plants with red flowers were back crossed, which of the following results indicate that the plants are heterozygousRed flowers, where red flowers are dominant?

Which of the following sequences is the correct evolutionary trend in plants?

Bees are of great importance to the farmer because they

<img alt="" class="alignnone size-full wp-image-222734" height="213" src="https://data.ulearngo.com/assets/77bd4443-df52-42c2-8ceb-359077465830" width="300"/>In the diagram, the arrow labelled II represents the

2012 WAEC SSCE Biology Past Questions