Genetics

2. a congenital absence of pigment in the skin and hair (which are white) and the eyes (which are usually pink
3. having two identical alleles of a particular gene or genes
4. a hybrid that is heterozygous for alleles of two different genes
6. the production by a single gene of two or more apparently unrelated effects
11. a type of inheritance in which two versions (alleles) of the same gene are expressed separately to yield different traits in an individual
13. a German surname, meaning "man from Saxony" or "man from Saxon extract"
15. to child
16. each of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome
17. the study of heredity and the variation of inherited characteristics
18. the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body

1. the genetic constitution of an individual organism
2. a form of short-limbed dwarfism
5. a rare, inherited disease that causes the progressive breakdown (degeneration) of nerve cells in the brain
7. the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment
8. the phenomenon whereby, in an individual containing two allelic forms of a gene, one is expressed to the exclusion of the other
9. a hybrid that is heterozygous with respect to a specified gene
10. a register recording a line of ancestors
12. The basic unit of heredity passed from parent to child
14. characteristic that can be passed from
15. a condition in which a person or animal has more than five fingers or toes on one, or on each, hand or foot