Finally, the genotype of an organism with two recessive alleles is called homozygous recessive. In the eye color example, this genotype is written bb. Of these three genotypes, only bb, the homozygous recessive genotype, will produce a phenotype of blue eyes.
What does it mean to be homozygous recessive?
Homozygous means that the organism has two copies of the same allele for a gene. An organism can be homozygous dominant, if it carries two copies of the same dominant allele, or homozygous recessive, if it carries two copies of the same recessive allele. … People with CF are homozygous recessive.
What is the phenotype of a heterozygous recessive?
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.
What is an example of a homozygous phenotype?
All other eye colors – blue, grey, green, and hazel – are recessive traits, represented by bb. 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.
Is BB homozygous dominant?
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 is phenotype example?
Examples of phenotypes include height, wing length, and hair color. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
Are humans heterozygous or homozygous?
Humans have two sets of chromosomes. Homozygous and heterozygous are terms that are used to describe allele pairs. Individuals carrying two identical alleles (RR or rr) are known as homozygous.
Homozygous vs Heterozygous.
|Only one type of gamete is produced||Two types of gametes are produced|
Are blue eyes homozygous or heterozygous?
We all have two alleles, or versions, of each gene. Being homozygous for a particular gene means you inherited two identical versions. It’s the opposite of a heterozygous genotype, where the alleles are different. People who have recessive traits, like blue eyes or red hair, are always homozygous for that gene.