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GENETICS VOCABULARY
BASIC VOCAB FOR GENETICS
24
Biology
9th Grade
11/24/2008

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Term
1. Allele
Definition
alternative forms of a gene for each variation of a trait of an organism
Term
2. Crossing over
Definition
— exchange of genetic material between non-sister chromatids
Term
3. Diploid
Definition
cell with two of each kind of chromosome; is said to contain a diploid, or 2n, number of chromosomes
Term
4. Dominant
Definition
observed trait of an organism that mask the recessive form of a trait
Term
5. Egg
Definition
haploid female sex cell produced by meiosis
Term
6. Fertilization
Definition
fusion of male and female gametes
Term
7. Gamete
Definition
male and female sex cells, sperm and eggs
Term
9. Genetics
Definition
branch of biology that studies heredity
Term
10. Genotype
Definition
combination of genes in an organism
Term
11. Haploid
Definition
cell with one of each kind of chromosome; is said to contain a haploid or n, number of chromosomes.
Term
12. Heredity
Definition
passing on of characteristics from parents to offspring
Term
13. Heterozygous
Definition
when there are two different alleles for a trait
Term
14. Homologous chromosome
Definition
paired chromosomes with genes fro the same traits arranged in the same order.
Term
15. Homozygous
Definition
when there are two identical alleles for a trait
Term
16. Hybrid
Definition
offspring formed by parents having different forms of a specific trait
Term
17. Law of independent assortment
Definition
— Mendelian principal stating that genes for different traits are inherited independently of each other.
Term
18. Law of segregation
Definition
Mendelian principal explaining that because each plant has two different alleles, it can produce two different types of gametes. During fertilization, male and female gametes randomly pair to produce four combinations of alleles
Term
19. Meiosis
Definition
type of cell division where one body cell produces for gametes, each containing half the number of chromosomes in a parent’s body.
Term
20. Nondisjunction
Definition
failure of homologous chromosomes to separate properly
Term
21. Phenotype
Definition
outward appearance of an organism
Term
23. Recessive
Definition
trait of an organism that can be masked by the dominant form of a
Term
25. Sperm
Definition
male sex cells
Term
26. Trait
Definition
characteristic that is inherited
Term
27. Zygote
Definition
diploid cell formed when a sperm fertilizes an egg
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