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?(1 point)
Responses
If a plant has purple flowers, then its genotype must be PP.
If a plant has purple flowers, then its genotype must be PP .
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 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.
If a plant has purple flowers, then its genotype must be Pp.
The correct conclusion is: If a plant has purple flowers, then its genotype must be Pp.
To understand why, let's consider the principle of dominance in genetics. In pea plants, the allele for purple flowers (P) is dominant over the allele for white flowers (p). This means that if an individual inherits both alleles (one from each parent), the presence of the dominant allele (P) will determine the phenotype, or observable trait.
The genotype refers to the genetic makeup of an individual, specifically the combination of alleles they possess. In this case, there are two possible genotypes for purple flowers: PP and Pp. However, since the allele for purple flowers (P) is dominant, an individual with either PP or Pp genotype will have purple flowers. Therefore, if a plant has purple flowers, its genotype could be either PP or Pp.
What is a phenotype of an organism?(1 point)
Responses
a combination of alleles
a combination of alleles
an observable trait
an observable trait
a section of DNA
a section of DNA
a structure that carries genetic information
An observable trait
What is an allele?(1 point)
Responses
a form of a gene
a form of a gene
the location of a gene on a chromosome
the location of a gene on a chromosome
a dominant form of a gene
a dominant form of a gene
the trait a gene controls
A form of a gene
Use the table to answer the question.
Plant A Plant B Plant C
tt TT Tt
The table shows the genotypes of three pea plants for the allele for height. Which prediction about the three plants is the most reasonable?
(1 point)
Responses
Plant B and Plant C will have similar heights.
Plant B and Plant C will have similar heights.
Plant A will be the tallest.
Plant A will be the tallest.
Plant C will be the shortest.
Plant C will be the shortest.
Plant A and Plant C will have similar heights.