Table of Contents
What is true of someone with a genotype TT?
An organism can be either homozygous dominant (TT) or homozygous recessive (tt). If an organism has two different alleles (Tt) for a certain gene, it is known as heterozygous (hetero means different)….Genotype and Phenotype.
| Genotype | Definition | Example |
|---|---|---|
| Homozygous recessive | Two recessive alleles | tt |
What does the genotype TT mean to genetics?
heterozygous condition
The notation Tt means the heterozygous condition, wherein the homologous pair contains different alleles of a gene. ‘Tt’ refers to the heterozygous condition with a dominant and a recessive allele and tallness being the dominant trait, it is expressed in the phenotype.
What is the phenotype for TT?
tall
The phenotype of a plant with the genotype Tt would be tall. Here tallness (T) is a dominant trait over dwarfness (t), which is recessive. Tallness and dwarfness (stem height) are one of the seven contrasting pairs of traits in pea plants studied by Mendel.
Is TT tall or short?
PROBLEM: Cross two heterozygous plants. Give genotypic and phenotypic ratios. The tall gene is this plant is incompletely dominant over the short gene. TT=Tall, Tt=medium, and tt=short.
Is TT a heterozygous or homozygous?
| Genotype | Definition | Example |
|---|---|---|
| Homozygous | Two of the same allele | TT or tt |
| Heterozygous | One dominant allele and one recessive allele | Tt |
| Homozygous dominant | Two dominant alleles | TT |
| Homozygous recessive | Two recessive alleles | tt |
Why is a plant with genotype TT referred to as heterozygous?
An organism can be either homozygous dominant (TT) or homozygous recessive (tt). If an organism has two different alleles (Tt) for a certain gene, it is known as heterozygous (hetero means different).
How are the plant height genotypes TT and TT similar?
Tallness is the recessive trait for plant height; therefore, the genotypes with Tt and TT would have the same phenotype. Tallness is a recessive trait in pea plants. C. Tallness is the dominant trait for plant height; therefore, the genotypes with Tt and TT would have the same phenotype.
Which of the following are autosomes?
An autosome is any of the numbered chromosomes, as opposed to the sex chromosomes. Humans have 22 pairs of autosomes and one pair of sex chromosomes (the X and Y). Autosomes are numbered roughly in relation to their sizes.
Why do TT and TT genotypes have the same phenotype?
What is the genotype ratio for TT and TT?
When cross takes place between Tt and tt two different types of alleles are form, Tt X tt = Tt, Tt, tt, and tt. The genotypic ratio for this cross is 1:1 and the phenotypic ratio is 1:1, where Tt is heterozygous dominant and tt is heterozygous recessive. This type of cross is a test cross.
What does tt mean in Punnett Square?
Explanation: In a Punnett square, lower case letters are recessive alleles and upper case letters are dominant alleles. So, “tt” would mean that both alleles are recessive. In comparison, “Tt” would mean that one allele is dominant and one is recessive.
What is meant by TT and TT in Mendelian terms?
TT represents homozygous tall, Tt represents heterozygous tall in Mendelian terms.