Which trait is going to show up in a heterozygous genotype?
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. Finally, the genotype of an organism with two recessive alleles is called homozygous recessive. In the eye color example, this genotype is written bb.
Is TT a heterozygous trait?
If an organism has two different alleles (Tt) for a certain gene, it is known as heterozygous (hetero means different).
Genotype and Phenotype.
|Homozygous||Two of the same allele||TT or tt|
|Heterozygous||One dominant allele and one recessive allele||Tt|
What letters would you use to show someone who is heterozygous for the trait?
Heterozygous always means one of each letter, so we‘d use “Tt” (where “T” = tall, & “t” = short). The only way for a pea plant to be short is when it has 2 lowercase “t’s”, so that short parent is “tt”.
How can you tell if someone is heterozygous or homozygous for a dominant trait?
If the test cross results in any recessive offspring, then the parent organism is heterozygous for the allele in question. If the test cross results in only phenotypically dominant offspring, then the parent organism is homozygous dominant for the allele in question.
What type of trait always shows up when present?
Dominant – An allele whose trait always shows up in the organism when it is present.