Mendel crossed two pea plants. One pea plant was homozygous tall (TT) and the other was homozygous short (tt). What are the possible phenotypes (how many tall plants and how many short plants did he get?)
I don't understand questions like this.
genotypes: Tt,Tt,tT,tT So the question is which gene is dominant, because all genotypes are Tt. Now Mr Mendel found that T was dominant, so Tt is dominated by tall, and will be tall. All will be tall, zero short.
Thanks I'm not good at this. Website to help me will be appreciated. Thanks again.
To understand the possible phenotypes resulting from Mendel's pea plant cross, we need to understand the concepts of dominant and recessive alleles. In this case, the allele for tallness (T) is dominant, while the allele for shortness (t) is recessive.
Mendel crossed two pea plants, one homozygous tall (TT) and the other homozygous short (tt). In this case, both plants are true-breeding, meaning they have identical alleles for the trait they exhibit.
When Mendel crossed these plants, he performed a monohybrid cross, focusing on one trait (in this case, plant height). The offspring, called the F1 generation, would inherit one allele from each parent.
Since the allele for tallness (T) is dominant over the allele for shortness (t), all of the F1 generation plants will be tall heterozygotes (Tt). This means that they will exhibit the tall phenotype.
Now, if we're looking at the possible phenotypes, we need to consider the F2 generation. When the F1 generation plants are allowed to self-pollinate, the segregation of alleles occurs.
In this case, the possible genotypes for the F2 generation will be TT, Tt, and tt. However, the Tt plants will exhibit the tall phenotype, while the tt plants will exhibit the short phenotype.
To determine the exact numbers of tall and short plants in the F2 generation, we need to use a Punnett square. A Punnett square is a visual tool used to predict the possible outcomes of a genetic cross.
In this scenario, when crossing two heterozygotes (Tt x Tt), the Punnett square predicts a phenotypic ratio of 3 tall plants (TT and Tt genotypes) to 1 short plant (tt genotype).
Therefore, Mendel would have obtained approximately 3 tall plants and 1 short plant in the F2 generation of his pea plant cross.