what does homozygous recessive mean?
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What does it mean to be homozygous dominant, heterozygous, or homozygous recessive? Best Answer: Heterozygous is when you have 2 different alleles for a certain characteristic: e.g. You could have a gene for brown eye colour on one chromosome and a gene for blue eyes on the other. In this case the dominant gene of the 2 would be expressed in the individual. Homozygous dominant is when the 2 alleles are the same and they are the dominant form of the gene. e.g. 2 brown eye genes BB Homozygous recessive is when the 2 alleles are the same and are the recessive form of the gene bb. Source(s): Chelsey Kimble · 7 years ago.
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Homozygous Dominant: Definition & Example Homozygous dominant is a genotype that consists of two dominant alleles for a gene. Although a homozygous dominant cat might have the same phenotype, or appearance, as a heterozygous one, the difference is that the homozygous dominant individual will 'breed true'.f a cat (or a person, or a pea plant) has two dominant alleles of a certain gene, we say it is homozygous dominant for that particular trait.
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- By Regina Bailey. Definition: Heterozygous refers to having two different alleles for a single trait. Related Terms: Allele, Genes, Homozygous. Examples: The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r).
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Recessive Trait: Definition & Example Recessive traits are those that are expressed or seen only when a homozygous recessive genotype is present. Homozygous recessive just means having two of the same recessive alleles. Remember, recessive alleles are masked by dominant alleles.emember, individuals must have two alleles for a gene, so someone could be homozygous dominant (EE), homozygous recessive (ee), or heterozygous (Ee). In this example, the recessive trait is having attached earlobes and is only seen in someone with the genotype ee (homozygous recessive).
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What is the opposite of homozygous of dominant? Answer by Lkstorer. Confidence votes 209. I would think the opposite of homozygous dominant is homozygous recessive. A genotype that is homozygous dominant contains two dominant alleles (forms of the gene), and one that is homozygous recessive contains two recessive alleles. Heterozygous would be in between the other two, with one dominant and one recessive allele.
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Medical Dictionary Heterozygous: Possessing two different forms of a particular gene, one inherited from each parent.
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- (2) Having two identical alleles that code for the same trait. Supplement. A ‘homozygous’ organism for a particular trait is described to possess either a pair of dominant alleles (e.g. AA) or a pair of recessive alleles (e.g. aa). Word origin: G. ‘homo’ meaning ‘same’ + zygous, which pertains to a zygote.Related forms: homozygosity (noun). ‘homozygous’ organism for a particular trait is described to possess either a pair of dominant alleles (e.g. AA) or a pair of recessive alleles (e.g. aa). Word origin: G. ‘homo’ meaning ‘same’ + zygous, which pertains to a zygote.
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Heterozygous: A Genetics Definition By Regina Bailey. Definition: Homozygous refers to having identical alleles for a single trait. Related Terms: Allele, Genes, Heterozygous. Examples: The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r).efinition: Homozygous refers to having identical alleles for a single trait. Related Terms: Allele, Genes, Heterozygous. Examples: The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r).
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test cross Recessive alleles only express their phenotype if an organism carries two identical copies of the recessive allele, meaning it is homozygous for the recessive allele. This means that the genotype of an organism with a dominant phenotype may be either homozygous or heterozygous for the dominant allele.
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- Heterozygous means there are two different alleles for the same gene ; Alleles may be a dominant and recessive pair or codominant ; Heterozygotes allow lethal characteristics to be passed to the next generation ; Learning Outcomes. When you are finished, you should be bale to: State what makes an allele pair heterozygous
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- For this to occur the parents are homozygous for a trait -- which means the parents must be both dominant or both recessive. See also: inbreeding. Please contribute to this project, if you have more information about this term feel free to edit this page.
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- Homozygous and Heterozygous. If an organism has two copies of the same allele, for example AA or aa, it is homozygous for that trait. If the organism has one copy of two different alleles, for example Aa, it is heterozygous. Keep in mind that an organism can't simply be 'homozygous,' period.
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X-linked recessive inheritance X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be expressed in males and in females who are homozygous for the gene mutation, see zygosity. X-linked inheritance means that the gene causing the trait or the disorder is located on the X chromosome. Females have two X chromosomes, while males have one X and one Y chromosome. Carrier females who have only one copy of the mutation do not usually express the phenotype,
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- Homozygous and Heterozygous. If an organism has two copies of the same allele, for example AA or aa, it is homozygous for that trait. If the organism has one copy of two different alleles, for example Aa, it is heterozygous.
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What Is the Difference Between Dominant and Recessive Genes? A person possessing one dominant allele and one recessive allele for a gene is said to be heterozygous for that trait because the alleles are different. However, if a person possesses two alleles that are the same, such as two dominant alleles or two recessive alleles, then that person is homozygous for that trait.
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What is a homozygous dominant trait? A dominant allele can show with only one copy present (B) and recessive needs two alleles present (bb) to show. Remembering that B = dominant, b = recessive... 1. 'Homo' = same. A homozygous trait means the alleles are the same (bb or BB) 2. As I said earlier, you can't really have a heterozygous recessive trait because that would just be Bb, and that's dominant! 3. Hetero = different. A heterozygous dominant trait would be composed of two different alleles, and since it's dominant those alleles would be 'Bb' 4. A homozygous recessive trait would have the same alleles but they would be recessive, so a homozygous recessive trait would be 'bb'. Hope that made some sort of sense!
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RECESSIVE The adjective RECESSIVE has 2 senses: 1. of or pertaining to a recession. 2. (of genes) producing its characteristic phenotype only when its allele is identical. Familiarity information: RECESSIVE used as an adjective is rare.
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What is homozygous? I would think the opposite of homozygous dominant is homozygous recessive. A genotype that is homozygous dominant contains two dominant alleles (forms of the gene), and one th … at is homozygous recessive contains two recessive alleles.
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- From Wikipedia, the free encyclopedia. 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.
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- Heterozygous. Definition. adjective. (1) Of, or pertaining to an individual (or a condition in a cell or an organism) containing two different alleles for a particular trait. (2) Having dissimilar alleles that code for the same gene or trait.xample: a zygote having one dominant allele and one recessive allele, i.e. Aa, for a particular trait. Word origin: G. heteros héteros the other of, two, other + different, zygous which pertains to a. Zygote related: forms (heterozygosity). noun
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HOMOZYGOUS, OR NOT HOMOZYGOUS? Heterozygous means that a horse has one copy of a gene for a dominant trait, and one copy of a recessive (non-trait) at that location in its genetic makeup. This horse will produce or pass along the dominant trait (like dun factor, roaning, gray, black, etc.) 50% of the time.
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heterozygous having two different alleles at corresponding loci on homologous chromosomes. An individual who is heterozygous for a trait has inherited an allele for that trait from one parent and an alternative allele from the other parent.An individual who is heterozygous for a genetic disease caused by a dominant allele, such as Huntington's disease, manifests the disorder.aving two different alleles at corresponding loci on homologous chromosomes. An individual who is heterozygous for a trait has inherited an allele for that trait from one parent and an alternative allele from the other parent.
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heterozygous heterozygous The genetics term heterozygous refers to a pair of genes where one is dominant and one is recessive — they're different. Like all words with the prefix hetero, this has to do with things that are different — specifically genes. This term sounds fancy and confusing, but it’s fairly simple: it has to do with traits you inherited from your parents that are different. Let's say your dad’s eyes are brown, your mom’s eyes are blue, and those heterozygous chromosomes led to your having green eyes. If you inherited the same gene from both parents, it’s homozygous — the same.
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Genetics This is crossing the unknown organism with a known homozygous recessive. If any of the offspring are homozygous recessive and show the recessive phenotype, then the unknown had to be heterozygous. Now, return to Genetics Practice Problems and complete the following steps: 1  Scroll down to Testcross.
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Genotypes and phenotypes Heterozygous means that an organism has two different alleles of a gene. For example, pea plants can have red flowers and either be homozygous dominant (red-red), or heterozygous (red-white). If they have white flowers, then they are homozygous recessive (white-white).eterozygous means that an organism has two different alleles of a gene. For example, pea plants can have red flowers and either be homozygous dominant (red-red), or heterozygous (red-white). If they have white flowers, then they are homozygous recessive (white-white).