Video Transcript
The following are the three stages of producing golden rice, in the wrong order. (X) Insert the gene for provitamin A production into the seeds of a rice plant. (Y) Find and extract the gene that controls provitamin A production. (Z) Grow these seeds to produce full plants. Place them in the correct order.
This question asks about golden rice. So what is golden rice exactly? Golden rice is a genetically modified version of the rice plant that can provide high
levels of vitamin A. Vitamin A is a very important nutrient. And if we don’t get enough of it in our diet, we can get a vitamin A deficiency. Vitamin A deficiency is common in developing countries. And it can cause blindness, reproductive issues, and even death. Children are most affected by vitamin A deficiency. And up to 2.7 million children can be saved each year if they had enough vitamin A in
their diet.
Golden rice doesn’t actually contain more vitamin A, but it contains high levels of
provitamin A. Provitamin A is also called carotene and is what gives carrots their orange
color. This is why golden rice is golden in color. When we eat golden rice, this provitamin A gets converted into vitamin A in our
body. This is how we can get vitamin A from golden rice. Golden rice was created by genetically modifying the seeds of a normal rice
plant. This rice plant has white rice because it doesn’t make provitamin A.
There’s a few steps to genetically modify the seeds of the rice plant to make golden
rice. First, the gene that gives the instructions for making provitamin A needs to be
isolated and extracted from DNA. This step is indicated by the letter (Y) in the question. So let’s mark that down in blue above. Next, this gene needs to be inserted into the DNA of the seeds of the white rice
plant. This step corresponds to the letter (X) from above. Now that the seeds have the provitamin A gene inside their DNA, all that needs to
happen is for these seeds to be planted to produce the golden rice plant. This step is given by letter (Z) above. We now have the answer to our question. The correct order for the three stages in producing golden rice is given by (Y), (X),
and (Z).
