Fill in the Blank

11. Mendel predicted that there are “units of heredity” which we now call __________.

12. A version or variant of a gene that produces a specific trait is called an _________.

13. A recessive phenotype can only be displayed if the genotype is ______________.

14. The chromosomes that underwent ____________________ during meiosis are called recombinant chromosomes, because they contain a region that has recombined to form a new pair of alleles.

15. When genes do not assort independently, the genes are said to be _________________ on the same part of the chromosome so they get passed on together.

16. A ____________ is a segment of DNA on a chromosome that codes for a particular trait.

17. Most sex-linked genes are on the____ chromosome, simply because they are built of much more DNA. However, _________ are more likely than _________ to exhibit sex-linked traits.
18. Sam’s mother has type O blood. Her father is type B blood, with the genotype BO. What are the possible blood types that Sam could have? (use scratch paper to make a punnett square)