How are the plant height genotypes TT and Tt similar?
Both are expressed as a short phenotype.
Both are expressed as a tall phenotype.
Both are examples of heterozygous genotypes.
Both are examples of homozygous genotypes.
Both TT and Tt genotypes are similar in that they are both examples of homozygous genotypes, where the plants have either two dominant alleles (TT) or two recessive alleles (tt) for the gene controlling plant height.
The genotypes TT and Tt are similar in that both are examples of homozygous genotypes. In this case, the plant height gene is represented by the letter "T," with "T" indicating the dominant allele that determines tall height and "t" indicating the recessive allele for short height.
Genotype TT means that both alleles are the same and both are dominant, so the plant will have a tall phenotype.
Genotype Tt means that there is one dominant allele (T) and one recessive allele (t), resulting in a heterozygous genotype. Despite being heterozygous, the dominant allele will still determine the plant's height, resulting in a tall phenotype.
So, to summarize, both TT and Tt genotypes result in a tall phenotype and are examples of homozygous and heterozygous genotypes, respectively.
To determine how the plant height genotypes TT and Tt are similar, we first need to understand what these genotypes represent. In this case, the T represents the dominant allele for tall height, while the t represents the recessive allele for short height.
Now, let's look at the options one by one:
1. "Both are expressed as a short phenotype."
This option is incorrect because genotype TT is expressed as a tall phenotype, not a short one. The phenotypes of the two genotypes differ.
2. "Both are expressed as a tall phenotype."
This option is also incorrect because genotype Tt is expressed as a tall phenotype, while genotype TT is expressed as a tall phenotype as well. Therefore, they share the similarity of expressing tall phenotypes.
3. "Both are examples of heterozygous genotypes."
This statement is incorrect because genotype TT is an example of a homozygous genotype, as it contains two copies of the dominant allele T. On the other hand, genotype Tt is an example of a heterozygous genotype, as it contains both a dominant allele T and a recessive allele t. So, they differ in terms of being homozygous or heterozygous.
4. "Both are examples of homozygous genotypes."
This statement is incorrect because genotype Tt is an example of a heterozygous genotype, not a homozygous genotype. Homozygous genotypes have two identical alleles for a particular gene, while Tt has one allele for tall height and one allele for short height.
In conclusion, the correct answer is that neither TT nor Tt share the similarity mentioned in the provided options.