An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb.
What is an example of a 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.
What type of phenotype is BB?
The physical appearance of the genotype is called the phenotype. For example, children with the genotypes ‘BB’ and ‘Bb’ have brown-eye phenotypes, whereas a child with two blue-eye alleles and the genotype ‘bb’ has blue eyes and a blue-eye phenotype.
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.
Is HH heterozygous or homozygous?
Half the possible offspring will be homozygous, HH, and half will be heterozygous, Hh.
Why are BB and BB considered homozygous combinations?
The first is homozygous, which means two copies of the same allele, like BB for two dominant alleles or bb for two recessive alleles. The other possible combination is heterozygous, which means one of each type of allele, like Bb for one dominant and one recessive allele.
What is AA in genotype?
The term “homozygous” is used to describe the pairs “AA” and “aa” because the alleles in the pair are the same, i.e. both dominant or both recessive. In contrast, the term “heterozygous” is used to describe the allelic pair, “Aa”.
What is an example of a Punnett square?
For instance, when a true-breeding tall pea plant is cross fertilized with pollen from a true-breeding short pea plant, the Punnett square can predict that all the offspring will be tall, and all of them will be heterozygous with both the allele for shortness and tallness.
Is AA Heterozygous dominant?
Two dominant alleles (AA) or two recessive alleles (aa) are homozygous. One dominant allele and one recessive allele (Aa) is heterozygous.
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 are the 3 types of genotypes?
There are three types of genotypes: homozygous dominant, homozygous recessive, and hetrozygous.
Is AA a heterozygous or homozygous?
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.
Is TT heterozygous?
If an organism has two different alleles ( Tt ) for a certain gene, it is known as heterozygous (hetero- means different).
|Heterozygous||One dominant allele and one recessive allele||Tt|
|Homozygous dominant||Two dominant alleles||TT|
Is KK a heterozygous or homozygous?
The testcross is another procedure to identify the genotype of a plant. In the testcross the plant in question is crossed with a plant homozygous and recessive for the trait being observed. In the F2 above, hooded plants were either homozygous (KK) or heterozygous (Kk).