Why does a Punnett square have four boxes?
You said each parent donates both of its alleles. The two alleles separate, and each parent passes on just one for the trait.
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1 lesson for “Punnett squares”
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What do you add to make x^2 + 6x a perfect square?
A perfect square like (x + 3)^2 is easy to solve. Completing the square builds one on purpose, right in the middle of an equation.
Try this lessonWhy is x^2 - 36 not (x - 6)(x - 6)?
x^2 - 36 looks like an ordinary binomial, but it carries a special pattern. A difference of two squares always factors into a sum times a difference.
Try this lessonWhy can't I just add the two legs?
Frida found the hypotenuse of a right triangle with legs 6 and 8 by adding 6 + 8 = 14. The lengths must be squared first.
Try this lessonWhat is (x^2 - 9)/(x^2 + 5x + 6) in lowest terms?
A fraction like this simplifies only after you factor the top and the bottom. Cancellation happens between factors, never between single terms.
Try this lessonWhat is f(-2) when f(x) = x^2 - 4x?
f(x) is a rule with a name, not multiplication. f(-2) means: feed -2 into the rule and see what comes out.
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