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3rd Quarter Quarterly
N/A
37
Biology
9th Grade
03/28/2011

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Term
Clone
Definition
A member of a population of genetically identical cells produced from a single cell.
Term
Genetic Engineering
Definition
Making changes in the DNA code of a living organism.
Term
Gel Electrophoresis
Definition
Procedure used to separate and organize DNA fragments (using gel, electric voltage, -DNA fragment moves to + end of gel)
Term
Recombinant DNA
Definition
DNA molecules produced by combining DNA from different sources.
Term
Sex-linked genes
Definition
Genes located on chromosomes that determine sex.
Term
Diploid
Definition
A cell that contains both sets of chromosomes (2n=8)
Term
Haploid
Definition
A cell that contains a single set of chromosomes(n=4)
Term
Meiosis
Definition
The process in which the number of chromosomes per cell is cut in half to make gametes.
Term
Crossing-Over
Definition
Occurs in meiosis 1, exchange of alleles between homologous chromosomes when they form tetrads and produces new combinations of alleles.
Term
Gene
Definition
The chemical factors that determine traits.
Term
Gamete
Definition
sex cells
Term
Punnett Square
Definition
A diagram used to determine possible gene combinations that might result from a genetic cross.
Term
Nucleotide
Definition
Units that make up DNA made up of a deoxyribose molecule, a phosphate group, and a nitrogenous base.
Term
RNA
Definition
Disposable copy of a segmnt of DNA. Contains Ribose, single stranded, & contains uracil instead of thymine.
Term
Transcription
Definition
Process in which RNA polymerase binds to DNA& separates the strands. Then the strand is used as a template from which which nucleotides are assembled into RNA.
Term
Codon
Definition
A word consisting of 3 consective nucleotides that specify a single amino aid that is to be added to the polypeptide.
Term
Translation
Definition
Process that takes place in the ribosomes in which the cell uses information from messenger RNA to produce proteins.
Term
Nitrogenous Bases
Definition
Purines (Adenine & Guanine) and Pyrimidines (Cytosine & Thymine)
Term
Mutations
Definition
Chages in the genetic material.
Term
Polyploid
Definition
An organism containing an extra set of chromosomes.
Term
Deletion
Definition
A frameshift mutation that can alter a protein so much that it is unable to do its normal functions.
Term
Seletive Breeding
Definition
Allowing only desired traits to go onto the next generation.
Term
Pedigree
Definition
A chart that shows the relationships within a family.
Term
Mitosis
Definition
The division of a cell nucleus.
Term
Interphase
Definition
A period in which a cell goes through growth, DNA replication, and Preparation for mitosis (G1, S, G2 phases)
Term
Fertilization
Definition
Process in sexual reproduction in which male reproductive cells and female reproductive cells join to form a new cell.
Term
DNA
Definition
Nucleic Acid that contains the sugar dexyribose, contains genetic instrictions.
Term
Spores
Definition
Haploid reproductive cells.
Term
Zygote
Definition
a fertilized egg
Term
Incomplete Dominance
Definition

When heterozygous individuals show a blended intermediate phenotype.

ex. Rr= pink flowers

Term
Homozygous
Definition
Two identical alleles for a trait (TT, ttHH)
Term
Heterozygous
Definition
Two different alleles for a trait (Tt).
Term
Allele
Definition
Different forms of a gene, code for a trait.
Term
Genotype
Definition
The genetic makeup
Term
Phenotype
Definition
Physical characteristics.
Term
Test Crosses
Definition
Used to test if a genotype is heterozygous or homologous when only the phenotype is given.
Term
Chromosomes
Definition
Structure that assorts independently during meiosis.
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