Biology 4B

2. in many traits one allele is dominant over the other allele. The "weaker (recessive)" allele is only expressed when it is paired with another recessive allele
3. expressed in a person who has only one copy of the gene associated with the trait.
7. An organism that has two different alleles for a trait
8. expressed in a person who has both copies of the gene associated with the trait.
13. Chromosomes that have the same sequence of genes, that have the same structure, and that pair during meiosis.
14. the result of a cross between two true-breeding parents that express different traits for only one characteristic
15. a diagram that is used to predict an outcome of a particular cross or breeding experiment

1. each member of a pair of homologous chromosomes separates independently of the members of other pairs so the results are random
4. alternative versions of a gene
5. a cross between individuals that have different alleles for the same gene
6. the biochemical units of heredity that make up the chromosomes; a segment of DNA capable of synthesizing a protein
9. An organism's genetic makeup, or allele combinations.
10. the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
11. pairs of homologous chromosomes separate in meiosis so that only one chromosome from each pair is present in each gamete
12. An organism that has two identical alleles for a trait