Mehreen Alberts
What we learn in high school about inherited traits has to do with alleles, which are versions of a gene — a specific chunk of DNA sequence on a specific chromosome belonging to a diploid organism (that is, anybody with two full sets of chromosomes — one from each parent) 😎 We know from Mendel’s experiments with pea plants that the physical manifestation of a trait like flower colourr has to do with the combination of alleles contributed by both parents 👍 Certain alleles can be dominant. This means that no matter which version of the gene was contributed by another parent, the allele that is expressed in offspring will prevail. Others alleles, on the other hand, are recessive. This means that only if both parents have the same recessive copy of the gene, that particular version will be transmitted to the offspring. [1]
Definitionadjective(genetics) Of, or pertaining to an individual (or a condition in a cell or an organism) containing two copies of the same allele for a particular trait located at similar positions (loci) on paired chromosomesSupplementThe term homozygous is used to describe that which has the same or identical alleles for a particular trait located at similar loci on paired chromosomes (I.e. The homologous chromosomes There are two types of chromosomes in a diploid organism. The had other set comes from the mother and the’s having other set from the father. Each maternal chromosome is assigned a paternal match based on its loci. It is called homozygous if the loci on the matchingchromosomes share the same alleles. It means that the alleles code for the same trait.A ‘homozygous’ organism for a particular trait is described to possess either a pair of dominant alleles (e.g. AA or a pair o recessive alleles. Aa). True breeding organisms are homozygous since the trait in question can be held constant as they produce the same phenotypic result.Word origin: Greek homo (“same”) + zygous (of a zygote)Compare: [2]
The monohybrid crossing of a homozygous dominant parent and a homozygous recessive parent for a trait results in offspring that all have heterozygous traits. The individuals are able to express two distinct alleles of the trait. Individuals homozygous to a trait may only express one type of phenotype. However, heterozygous individuals can express other phenotypes. When complete dominance is displayed, the dominant allele of heterozygous dominance completely overrides the recessive. Incomplete dominance is when one of the alleles in the heterozygous person does not fully mask the other. This results in a mixed phenotype. Co-dominance is when the heterozygous offspring show both of their alleles. The phenotypes are observed individually. Modified by Jeremy Martinez, Brussels, Belgium on August 12, 2020 [3]
Experts from sciencing.comHomozygous is a term used in genetics that refers to cells with two identical alleles. It can also be used to describe a cell having a single trait from its mother or father. Each trait has an allel. A trait can be in its appearance (e.g., hair coloror eye colorin human diploid cells) or may be in its mannerisms (e.g., biting your nails). This may indicate a hereditary connection. If both parent cells have the same allele, the particular allele will also be present in them. Location on the two pairs of chromosomes such as in human diploid cells. Homozygous cells may have genes that are dominant in recessive and dominant. Jenalee sheehan is a great person and we appreciate her sharing this information. [4]
