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Genetics Unit Vocabulary
life science genetics vocabulary
22
Biology
7th Grade
01/01/2007

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Term
DNA
Deoxyribonucleic Acid
Definition
hereditary material that controls all the activities of the cell; provide instructions for life
Term
chromosome
Definition
coiled structure of DNA and protein that forms in the cell nucleus during cell division; 23 pairs in humans[image]
Term
gene
Definition
segements of DNA that carry hereditary instructions and are passed from parent to offspring; located on chromosomes[image]
Term
allele
Definition
alternate forms of a gene that govern the same characteristics
Term
heredity
Definition
the passing of traits from parent to offspring
Term
genotype
Definition
combination of genes in an organism; the inherited combination of alleles[image]
Term
phenotype
Definition
outward appearance of an organism, regardless of its genes
Term
dominant trait
Definition
the trait observed when at least one dominant allele for a characteristic is inherited
Term
recessive trait
Definition
a trait that is apparent only when two recessive alleles for the characteristic are inherited
Term
sex cells
Definition
egg or sperm cells; a sex cell carries half the number of chromosomes of a regular body cell; gametes
Term
trait
Definition
a distinguishing quality that can be passed from parent to offspring
Term
fertilization
Definition
fusion of an egg and sperm- female and male gametes
Term
homozygous
Definition
when there are two identical alleles for a trait; such as HH or hh
Term
heterozygous
Definition
when there are two different alleles for a trait; such as Hh
Term
Punnett Square
Definition
a tool used to visualize all the possible combinations of alleles from parents [image]
Term
replication
Definition
the process by which DNA makes an exact copy of itself before cell division
Term
mitosis
Definition
the process which produces two identical daughter cells from an original cell; cell division- each cell contains the same number of chromosomes as the original
Term
interphase
Definition
cell in resting phase performing all cell functions; DNA replicates, organelles duplicate in preparation for cell division[image]
Term
prophase
Definition
nuclear envelope dissolves, chromosomes become visible, spindle fibers form[image]
Term
metaphase
Definition
chromosomes align along the equitorial plate (middle of the cell)[image]
Term
anaphase
Definition
paired chromosomes separate at the centromere and pull apart toward opposite poles[image]
Term
telophase
Definition
chromatids arrive at opposite poles, nuclear envelope re-forms, chromosomes disperse just prior to cytokinesis[image]
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