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Biology Chapter 10-Mr.Jorstad
Vocab
26
Science
10th Grade
02/05/2007

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Term
Allele
Definition
Alternatve forms of a gene for each variation of a trait of an organism.
Term
Fertilization
Definition
Fusion of male and female gametes.
Term
Heredity
Definition
Passing on of characteristics from parents to offspring.
Term
Homozygous
Definition
When there are two identical alleles for a trait.
Term
Law of Segration
Definition
Mendelian principle explaining that because each plant has two different alleles, it can produce two different types od gametes. During fertilization, male and female gametes randomly pair to produce four combinations of alleles.
Term
Phenotype
Definition
Outward appearance of an organism, regardless of its genes.
Term
Recessive
Definition
Trait of an organism that can be mistaked by the dominant form of a trait.
Term
Crossing Over
Definition
Exchange of genetic material between nonsister chromatids from homologous chromosomes during phase 1 of meiosis; Results in new allele combinations.
Term
Egg
Definition
Haploid female sex cell produced by meiosis.
Term
Haploid
Definition
Cell with one of each kind of chromosomes; Is said to contain a haploid or n, number of chromosomes.
Term
Meiosis
Definition
Type of cell division where one body cell produces four gametes, each containing half the number of chromosomes as a parent's body cell.
Term
Sexual Reperduction
Definition
Pattern of reproduction that involves the production and subsequent fusion of haploid sex cells.
Term
Zygote
Definition
Diploid cell formed when a sperm fertilizes an egg.
Term
Dominant
Definition
Observed trait of an organism that masks the recessive form of a trait.
Term
Gametes
Definition
Male and female sex cells; Sperm and eggs.
Term
Genotype
Definition
Combination of genes in an organism.
Term
Heterozygous
Definition
When there are two different alleles for a trait.
Term
Hybrid
Definition
Offspring formed by parents having different forms of a trait.
Term
Law of Independent Assortment
Definition
Mendelian principle stating that genes for different traits are inherited independently of each other.
Term
Pollination
Definition
Transfer of male pollen grains to the pistil of a flower.
Term
Trait
Definition
Characteristic that is inherited; Can be either dominant or recessive.
Term
Diploid
Definition
Cell with two of each kind of chromosomes; Is said to contain a diploid, or 2n, number of chromosomes.
Term
Genetic Recombination
Definition
Major source of genetic variation among organisms caused by reassortment or crossing over during meiosis.
Term
Homologous Chromosome
Definition
Paired chromosomes with genes for the same traits arranged in the same order.
Term
Nondisjunction
Definition
Failure of homologous chromosomes to seperate properly during meiosis; Results in gametes with too many or too few chromosomes.
Term
Sperm
Definition
Haploid male sex cells produced by meiosis.
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