This answer is TRUE !! Hope this helps you out a little :)
Fingernails are made of protein and keratin. Gypsum is softer than a fingernail.
<em>50% of the sons have the disorder. </em>
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When this couple has children, one half of their sons will have the disorder. When a male has an X-linked, recessive disorder, his genome will be YXₙ, where Xₙ represents his affected X-chromosome. Since boys can only have one X-chromosome, they cannot be carriers. Having one affected X-chromosome makes them have the condition. His wife, who is not a carrier and does not have the condition will have the genome XX. As you can see in the punnet square, this cross will lead to two sons, one of which has the color-blindness gene. So, 50% of the sons will have the disorder.
C) All variables are measured to provide data for the experimental results.
A is untrue because the independent variable will be changed to see how it changes the results.
B is untrue because the controlled variable will not be affecting the experiment because it is unchanging throughout the experiment.
D is untrue because the controlled variable will NOT be changing throughout the experiments.
Primary producers are mostly plants. Primary producers will probably experience some downfall due to the large number of fish. And if the producer species becomes extinct, then that could mean disaster for the entire community. I hope this was helpful in some way!