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Heredity

Words

TermDefinition
DNA A molecule that is present in all living cells and that contains the information that determines the traits that a living thing inherits and needs to live
Chromosomes One of the structures in the nucleus that are made up of DNA and protein
Cell Cycle The life cycle of a cell
Interphase The period of the cell cycle during which activities such as cell growth and protein synthesis occur without visible signs of cell division
Mitosis A process of cell division that forms two new nuclei, each of which has the same number of chromosomes
Cytokinesis The division of the cytoplasm of a cell
Homologous Chromosomes Chromosomes that have the same sequence of genes and the sam structure
Meiosis A process in cell division during which the number of chromosomes decreases to half the original number by two divisions of the nucleus, which results in the production of sex cells
Asexual Reproduction One parent that can produce offspring that are generally identical to the parent
Sexual Reproduction Reproduction in which the sex cells from two parents unite to produce offspring that share traits from both parents
Fertilization The union of a male and female gamete to form a zygote
Heredity The passing of genetic material from parent to offspring
Gene One set of instructions for an inherited trait
Allele One of the alternative forms of a gene that governs a characteristic, such as hair color
Genotype The entire genetic makeup of an organism; also the combination of genes for one or more specific trits
Phenotype An organism's appearance or other detectable characteristic
Dominant Describes an allele that is fully expressed whenever the allele is present in an individual
Recessive Describes an allele that will be marked unless the organism is homozygous for the traits
Incomplete Dominance A condition in which two allele are expressed such that the phenotype of a heterozygous individual is an intermediate of the phenotypes of the two homozygous parents
Codominance A condition in which two alleles are expressed such that the phenotype phenotypes of the two homozygous parants
Punnett square A graphic used to predict the results of a genetic cross
Probability The likelihood that a possible future event will occur in any given instance of the event
Ratio A comparison of two numbers using division
Pedigree A diagram that shows the occurrence of a genetic trait in several generations of a family
Created by: purplequeen
 

 



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