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SCI 7 Unit 3
Genetics
Term | Definition |
---|---|
Cell Division | The process by which one cell replicates their genetic material and then divides into one or more cells |
DNA | Two strands of molecules that join together as a twisted ladder that contains all genetic material |
Chromosome | Compacted DNA molecules; looks like an “X” |
Mitosis | The division of the nucleus to form two identical cells. |
Cancer | Abnormal Division of cells producing a clump of cells called a tumor. |
Asexual Reproduction | One parent produces one or more identical offspring |
Sexual Reproduction | Involves two parents and produces one or more new organisms that have a mix of genetic material from both parents |
Meiosis | Cell division that produces sex cells that have only half the number of chromosomes |
Sperm | A sex cell, contains half the chromosomes of the male. |
Egg | A sex cell, contains half the chromosomes of the female. |
Heredity | The passing of physical or mental characteristics from one generation to the next. |
Pedigree | A chart that shows the family history of an individual |
Gregor Mendel | Mid-nineteenth century monk who is credited as the father of genetics. |
Purebred | An organism of many generations that have the same form of a trait. |
Trait | Physical characteristics of an organism that are influence by DNA. |
Gene | A unit of heredity that occupies a specific location on a chromosome. |
Allele | A variation in a gene |
Dominant Alle | The variation in a gene whose trait always shows up when the allele is present. |
Recessive Allele | The hidden trait whenever a dominant variation is present. |
Punnet Square | A chart that shows all the possible ways alleles can combine in a genetic cross. |
Genotype | A specific allele combination |
Phenotype | The physical trait expressed by the alleles |
Mutation | A random change in DNA, can be good, bad, or neutral. |