What is the difference between the terms homozygous heterozygous and hemizygous - pvj

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The locus of these genes is same for homologous chromosomes. For example, locus of gene X would be same on maternal as well as on paternal chromosome.

At this point it is important that we know the difference between gene and alleles to understand this concept. In case you want to know more about it visit our blog on Gene and Alleles. On the homologous pairs of chromosome we can either have same alleles both either brown or blue or different alleles brown and blue.

Only these possible combinations can be there. So based on whether we have got the same alleles or different alleles we describe the terms homozygous and heterozygous. Homozygous means both alleles present on the homologous chromosomes for a given gene are same. For example, either both alleles code for brown color, so the genotype BB or both alleles code for blue color, so the genotype is bb.

Heterozygous means both alleles present on the homologous chromosomes for a given gene are different. For example, one chromosome in homologous pair contains brown color allele B and the other chromosome contains blue color allele b. So the genotype is Bb.

In simple terms hemizyogous means hemi means half. That means only half is present which means only one allele is present instead of two in a diploid organism.

This condition is present in males for sex linked genes on X chromosome. Because males are XY, they have only one copy of X chromosome. He called dwarfism recessive because it was masked in the offspring if one of the purebred parents possessed the dominant characteristic. An oval-shaped face is a dominant feature, while a square-shaped face is recessive.

For example, the heterozygous genotype for earlobe type Ee produces detached earlobes because the dominant allele E hides the effects of the recessive allele e.

The homozygous dominant genotype EE also produces detached earlobes, so detached earlobes are considered the dominant trait. If both parents do not have the trait and the child does, it is recessive.

If one parent has the trait and the child does or does not, it is dominant. Recessive alleles only show their effect if the individual has two copies of the allele also known as being homozygous? Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Physics What does heterozygous positive mean?

Ben Davis September 30, What does heterozygous positive mean? Which one is a heterozygous condition? What are examples of heterozygous? What is the phenotype of a heterozygous individual?

What causes heterozygous? How many loci are in heterozygous condition? What is the difference between heterozygous and Hemizygous? Are humans homozygous? What is male and female heterozygosity? Is homozygous purebred? Is nn dominant or recessive? Is face shape dominant or recessive? Is EE dominant or recessive?