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Biology-Genetics
Genetics
Term | Definition |
---|---|
Allele | Different forms of a gene |
dominant trait | A trait expressed in the phenotype if the dominant allele is present in the genotype. (B) |
recessive trait | one that is seen only if both parents give the allele for the trait ( if both have b) |
Gamete | sex cell; an egg or a sperm cell |
zygote | fertilized egg |
Chromosome | A threadlike, gene-carrying structure found in the nucleus. Each chromosome consists of one very long DNA molecule and associated proteins. |
Gene | A segment of DNA on a chromosome that codes for a specific trait |
Heterozygous | having two different alleles Bb |
Homozygous | Having two identical alleles BB, bb |
Phenotype | physical characteristics of an organism |
Genotype | genetic makeup |