HomozygousAn separation, personal, instance that has two copies of the very same allele for a details gene is homozygous. ahead PageNext Page
Vocabulary ongoing Mendel"s experiment led that to think that there were two copies of every gene. Through our existing understanding that chromosomes this makes sense however it to be puzzling come his contemporaries. This next group of state share in usual that we need to think around two copies of each gene.

You are watching: Genotypes made of the same alleles

Allele Alleles room variations the a gene. Because that this week"s rap we begin with a factor to consider of the coat shade gene in cattle. Us will discuss two sports of the coat color gene: red and also black. The red allele is responsible because that red coat color and the black color allele causes black coat color. We largely use letters as one abbreviation because that alleles, B = black, b = red.
HeterozygousAn individual that contains two different alleles that a gene is heterozygous.
ExamplesA cow that has actually two alleles for a red coat is homozygous (bb). A bull v two alleles for a black color coat is homozygous (BB).

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A calf that has actually one allele because that red cloak color and one allele for black color coat color is heterozygous (Bb).

Heterozygous people contain two different alleles which results in conflict instructions. One gene says "black coat" while the other says "red coat". What will the an outcome be?
Dominant allele The allele the is watched (or expressed) in a heterozygote is claimed to it is in dominant. We generally use a resources letter come indicate prominence (B). Recessive alleleThe allele the is surprise (or suppressed) in a heterozygote is claimed to it is in recessive. We normally use a lower situation letter to indicate recessiveness (b).
ExamplesA heterozygous calf has one red allele and also one black allele (Bb). These pets are constantly black. This tells you that the black color allele is dominant and also the red allele is recessive due to the fact that the black color coloration is hiding the red. We usage "B" to show the dominant black allele and also "b" for the recessive red allele.

If you take place upon a stray calf in the center of the roadway it is pretty easy to figure out the color the animal but deserve to you recognize the alleles that it carries?
PhenotypeThe figure of an animal (or any kind of other form of life) is taken into consideration its phenotype (think ph = physical). GenotypeAn animal"s genotype is its genetic make-up (think gen = genetic).
ExamplesBlack is the phenotype the a calf with at least one black color (B) allele. Red is the phenotype of a calf v two red (bb) alleles. Two calves might be the same phenotype and also yet be various genotypes. Livestock that space BB room black yet so are pets that space Bb: Two various genotypes that have actually the exact same phenotype. What is the genotype of a calf that has actually a red phenotype?