Genetics

3. occurs when a single gene has more than one effect
5. individual that is heterozygous for two traits; shows teh phenotype governed by the dominant alleles but carries the recessive alleles
6. it masks the expression of the other allele
8. Mendel's first law of heredity
9. occurs when a trait is governed by two or more sets of alleles
12. physical apperance of the individual
14. the chance of two or more independent events occurring together is the product of their chances of occurring separately
16. shows the relative distance between the gene loci on a chrmomsome
19. existence of several alleles on the same chromosome
21. genes carried on the X chromosome
23. contain recombined alleles, byt they occur in reduced numbers because crossing-over is infrequent
24. refers to the alleles an individual receives at fertilization

1. exhibited when the heterozygote has an intermediate phenotype between that of either homozygote
2. controlled by polygenes subject to enviromental influences
4. Mendel's second law of heredity
7. the type you are most likely to find in nature
10. more than one allele is fully expressed
11. this individual has two different allels for the trait
13. usually do not exhibit a recessive trait, but they are capable of passing on a recessive allele for a trait.
15. the allele that is not expressed and can be masked
17. all possible types of sperm are lined up vertically, and all possible types of eggs are lined up horizontally so that every possibel combination of gametes the offspring may inherit occurs
18. used to determine whether an individual with the dominant trait has two dominant factors for a particulat trait
20. alleles that occur on the chromosomes at particular locations
22. an organism has two identical alleles