homozygote and heterozygote
- homozygote and heterozygote
-
Two genetic possibilities for a fertilized egg.
If the two sex cells (gametes) that fuse during
fertilization carry the same form of a
gene for a specific trait, the organism is said to be a homozygote for that trait. If the gametes carry differing forms of the gene, the result is a heterozygote. Because genes may be either dominant or recessive (see
dominance and
recessiveness), the genetic composition (
genotype) of an organism cannot always be determined by the organism's physical appearance (
phenotype).
* * *
Universalium.
2010.
Look at other dictionaries:
Heterozygote advantage — A heterozygote advantage (heterozygous advantage) describes the case in which the heterozygote genotype has a higher relative fitness than either the homozygote dominant or homozygote recessive genotype. The specific case of heterozygote… … Wikipedia
Homozygote — A person who has two identical forms of a particular gene, one inherited from each parent. For example, a girl who is a homozygote for cystic fibrosis (CF) received the CF gene from both of her parents and therefore has CF. The opposite of a… … Medical dictionary
homozygote — /hoh meuh zuy goht, zig oht, hom euh /, n. Biol. an organism with identical pairs of genes with respect to any given pair of hereditary characters, and therefore breeding true for that character. [1900 05; HOMO + ZYGOTE] * * * ▪ biology an… … Universalium
heterozygote — [ˌhɛt(ə)rə(ʊ) zʌɪgəʊt] noun Genetics an individual having two different alleles of a particular gene or genes, and so giving rise to varying offspring. Compare with homozygote. Derivatives heterozygosity noun heterozygous adjective … English new terms dictionary
homozygote — [ˌhɒmə(ʊ) zʌɪgəʊt, ˌhəʊm ] noun Genetics an individual having two identical alleles of a particular gene or genes and so breeding true for the corresponding characteristic. Compare with heterozygote. Derivatives homozygosity noun homozygous… … English new terms dictionary
Dominance (genetics) — For other uses, see Dominance. A pedigree chart shows how genes are inherited. Dominance in genetics is a relationship between two variant forms (alleles) of a single gene, in which one allele masks the effect of the other in influencing some… … Wikipedia
Quantitative genetics — Part of a series on Genetics Key components Chromosome DNA • RNA Genome Heredity Mutation Nucleotide Variation … Wikipedia
Lethal alleles — Alleles that cause an organism to die are called lethal alleles, where the gene involved is an essential gene. When Mendel s Laws were rediscovered, geneticists believed that mutants would only alter the appearance of a living organism. However,… … Wikipedia
Polymorphism (biology) — Light morph Jaguar (typical) Dark morph or melanistic Jaguar (about … Wikipedia
Drépanocytose — Référence MIM 603903 Transmission Autosomique récessive Chromosome Chromosome 11 11p11.5 Gène β globine Empreinte parentale … Wikipédia en Français
