Use the table to answer the question.
the genotypes of three pea plants for the allele for height. Which prediction about the three plants is the most reasonable?
Plant A Plant B Plant C
tt TT Tt
CHOOSE ONE OF THE FOLLOWING ANSWERS
Plant C will be the shortest.
Plant B and Plant C will have similar heights.
Plant A and Plant C will have similar heights.
Plant A will be the tallest.
The most reasonable prediction is that "Plant A will be the tallest." This is because Plant A has the genotype "tt," which represents a homozygous recessive genotype for height. Homozygous recessive genotypes typically result in shorter heights compared to homozygous dominant genotypes (TT) or heterozygous genotypes (Tt). Plant B has the genotype "TT," representing a homozygous dominant genotype, while Plant C has the genotype "Tt," representing a heterozygous genotype. Since Plant A is homozygous recessive, it is most likely to be the shortest plant.
wrong the options are
Plant C will be the shortest.
Plant B and Plant C will have similar heights.
Plant A and Plant C will have similar heights.
Plant A will be the tallest.
Apologies for the confusion. In that case, the most reasonable prediction would be "Plant B and Plant C will have similar heights." This is because Plant B is homozygous dominant (TT) and Plant C is heterozygous (Tt), meaning they both have at least one dominant allele. Having at least one dominant allele typically results in taller heights compared to having two recessive alleles (as in Plant A, tt). Therefore, it is reasonable to expect that Plant B and Plant C, with dominant alleles, will have similar heights.
In pea plants, the allele for purple flowers, P, is dominant over the allele for white flowers, p. Which conclusion about phenotype and genotype is possible?
If a plant has white flowers, then its genotype must be Pp .
If a plant has white flowers, then its genotype must be pp .
If a plant has purple flowers, then its genotype must be Pp .
If a plant has purple flowers, then its genotype must be PP.
The correct conclusion about phenotype and genotype is "If a plant has purple flowers, then its genotype must be Pp." This is because the allele for purple flowers (P) is dominant over the allele for white flowers (p). Therefore, a plant with the phenotype of purple flowers could have a genotype of either PP (homozygous dominant) or Pp (heterozygous), but it could not have a genotype of pp (homozygous recessive) because the dominant allele would override the expression of the recessive allele.
What is a phenotype of an organism?
a structure that carries genetic information
an observable trait
a section of DNA
a combination of alleles
A phenotype of an organism is an observable trait. It refers to the physical or biochemical characteristics of an individual that can be observed or measured, such as hair color, height, or eye color. Phenotypes are determined by the combination of an organism's genotype (genetic information) and the influence of environmental factors.
What is an allele?
a dominant form of a gene
a form of a gene
the location of a gene on a chromosome
the trait a gene controls
An allele is a form of a gene. Genes are segments of DNA that contain instructions for building and functioning of an organism. Alleles are different versions or variants of a gene, which can occur due to differences in DNA sequences. Each individual has two alleles for each gene, one inherited from each parent. These alleles can be the same (homozygous) or different (heterozygous), and they determine the variation in traits or characteristics that an organism may possess.
To answer this question, we need to understand how the alleles for height (T and t) interact and determine the height of pea plants. In this case, uppercase T represents the dominant allele for tall height, and lowercase t represents the recessive allele for short height.
Looking at the genotypes of the three plants:
Plant A: tt
Plant B: TT
Plant C: Tt
From the genotype, we can determine the phenotype, which is the physical expression of the genotype. In this case, the phenotype is the height of the pea plant. Tall height is determined by having at least one dominant allele (T), while short height is determined by having two recessive alleles (tt).
Using this information, we can make predictions about the heights of the three plants:
1. Plant C will be the shortest: This prediction is incorrect. Plant C has one dominant allele (T) and one recessive allele (t). Since the dominant allele (T) is present, Plant C will have tall height.
2. Plant B and Plant C will have similar heights: This prediction is correct. Both Plant B (TT) and Plant C (Tt) have at least one dominant allele (T), so they are both predicted to have tall height.
3. Plant A and Plant C will have similar heights: This prediction is incorrect. Plant A (tt) has two recessive alleles (t), indicating short height. In contrast, Plant C (Tt) has one dominant allele (T) and one recessive allele (t), indicating tall height. Therefore, they are not expected to have similar heights.
4. Plant A will be the tallest: This prediction is incorrect. Plant A (tt) has two recessive alleles (t), indicating short height. Therefore, it is predicted to be the shortest among the three plants.
Based on the genotypes and the patterns of inheritance for the allele of height, the most reasonable prediction is that Plant B and Plant C will have similar heights.