Human Genetics: Test Your Understanding (continued)
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Critical Thinking: How could genes flow from genetically modified crops into the wider population
of crops and other plants, and what effect might this have?
Sample answer: Gene flow might occur during pollination of crops. Pollen from genetically modified
crops could reach related wild plants. If fertilization occurs, artificially introduced genes for herbicide-
or insecticide-resistant could be spread to weeds.
Critical Thinking: If colorblindness is an X-linked trait, what is the probability of a colorblind male (XY)
producing a colorblind child with a female (XX) who is not colorblind, and why?
The probability is 0%. Because the female is not colorblind, neither of her alleles carry the trait.
The probable offspring of this union would be 50% female carriers and 50% normal males.
