Which alleles are homozygous?

If the alleles are identical, you’re homozygous for that specific gene. For instance, it could mean you have two alleles for the gene that causes brown eyes. Some alleles are dominant, while others are recessive. The dominant allele is expressed more strongly, so it masks the recessive allele.

Are the alleles TT heterozygous or homozygous?

If an organism has two different alleles (Tt) for a certain gene, it is known as heterozygous (hetero means different).

Genotype and Phenotype.

Genotype Definition Example
Heterozygous One dominant allele and one recessive allele Tt
Homozygous dominant Two dominant alleles TT
Homozygous recessive Two recessive alleles tt

Are dominant alleles homozygous?

An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.

What’s an organism’s genotype?

A genotype is an individual’s collection of genes. The term also can refer to the two alleles inherited for a particular gene. The genotype is expressed when the information encoded in the genes’ DNA is used to make protein and RNA molecules.

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Is PP genotype or phenotype?

There are three available genotypes, PP (homozygous dominant ), Pp (heterozygous), and pp (homozygous recessive). All three have different genotypes but the first two have the same phenotype (purple) as distinct from the third (white).

What is heterozygous and homozygous examples?

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). Carriers are always heterozygous.

What is homozygous example?

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.

Which of the following is an example of a homozygous genotype?

A homozygous brown-eyed person would have the BB gene, while a homozygous blue-eyed person would have the bb gene. An individual has the dominant SS gene, a homozygous gene that results in farsightedness. However, his friend has the homozygous gene ss for the recessive trait, which is normal sight.

What are heterozygous alleles?

Getty Images. Heterozygous is a term used in genetics to describe when two variations of a gene (known as alleles) are paired at the same location (locus) on a chromosome. By contrast, homozygous is when there are two copies of the same allele at the same locus.

Is BB heterozygous or homozygous?

A bull with two alleles for a black coat is homozygous (BB). A calf that has one allele for red coat color and one allele for black coat color is heterozygous (Bb). Heterozygous individuals contain two different alleles which results in conflicting instructions.

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What’s an example of heterozygous?

If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed.

Does genome include RNA?

A genome is the complete set of DNA (or RNA in RNA viruses) of an organism. It is sufficient to build and maintain that organism. … The genome includes both coding regions (genes) and non-coding DNA, probably present in the nucleus, mitochondrion, chloroplast (for plants), and cytoplasm.

What is the genotype of the heterozygote?

Listen to pronunciation. (HEH-teh-roh-ZY-gus JEE-noh-tipe) The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).

What are identical alleles?

Copies of genes are referred to as “alleles,” and because of the way reproduction works, the alleles can carry identical copies of a gene or different copies, depending on what is passed on by each parent. Identical alleles means that a person’s genotype for that trait is homozygous.