Download Biology 2 Unit 1 DNA Question and Answer 1. Describe the two

Biology 2 Unit 1
DNA Question and Answer
1. Describe the two main phases of the cell cycle.
2. What must happen before mitosis can begin?
3. What is produced by mitosis?
4. What are the four steps of mitosis, in order? Hint: The acronym PMAT gives you the first letter of each step, in
order.
5. How does meiosis introduce genetic variation into offspring? Think about how the chromosomes line up.
6. How do the products of meiosis compare to the original cell? Think about chromosome number.
7. Why are there two sets of phases during meiosis, but only one during mitosis? Think about what is different
about meiosis and mitosis.
8. A plant can have either tall (T) stems or short (t) stems. Two plants are crossed. One has the genotypeTt and
the other has the genotype Tt. Fill in the Punnett square below for this cross.
What is the genotype ratio for this cross?
9. Two different plants are crossed. One has the genotype tt and the other has the genotype Tt. Fill in the
Punnett square below for this cross. Remember, one parent allele goes in each space on the top and side.
What is the genotype ratio for this cross? (1 point)
What is the phenotype ratio for this cross? (1 point)
10. A plant can have yellow (Y) or green (y) leaves. It can also have smooth (S) or rough (s) seeds. Answer the
following questions about this plant.
A plant has YySs. What is the phenotype? Explain.