This worksheet will take about 20 minutes for most students, I usually give it to them after a short lecture on solving genetics problems. I don't normally take a grade on it, instead just monitor progress of students as they work and then have them volunteer to write the answers #5-15 on the board.
2. For each of the genotypes below, determine the phenotype.
Straight hair is dominant to curly.
I've only included a couple of squares as samples here, most of these are very straightforward. Given enough practice, students will learn to do most of them without the squares.
5. A TT (tall) plant is crossed with a tt (short plant).
wrinkled seeded plant. What are the genotypes of the parents?
9. In pea plants purple flowers are dominant to white flowers.
If students are stuck on this one, advise them to make a "key" to help them sort it out.
12. In guinea pigs, the allele for short hair is dominant.
Why did I use H instead of S for short hair. Students may discover the hard way that capital and lower case S's are hard to tell apart. This is a good time to talk to them about how to choose their letters. You can choose the letter of the dominant trait, or you can chooe the letter for the trait itself (H is for hair).