Answer :
The best Punnett square for a cross between a true-breeding red-flowered geranium (RR) and a heterozygous red-flowered geranium (Rr) results in all offspring having red flowers, with genotypes RR and Rr.
The horticulturist wants to produce geraniums with specific flower colors by performing a genetic cross. Here, we have a plant true-breeding for red flowers, which would have the genotype RR (homozygous for red allele), and a plant that is heterozygous for red flowers, with the genotype Rr. The trait of red flowers is governed by the allele r, with red being represented by R and white by r. When these plants are crossed, the Punnett square would look like this:
R r
R RR Rr
R RR Rr
In this Punnett square, all possible combinations of parental alleles are listed with the true-breeding parent's alleles (RR) on one side, and the heterozygous parent's alleles (Rr) on the other side. As a result, the expected genotypes of the offspring would be RR and Rr, and they would all exhibit the red-flower phenotype since R is the dominant allele for red flowers.
The red plant is diploid for red flowers, hence the answer is A. (Rr). If a flower with the Rr genotype is crossed with a plant with the rr genotype, the resultant plants will have red blooms on half of them and white flowers.
What biological connections do plants have?
The biological mechanisms and biochemistry used by animals, microorganisms, and plants are the same. However, the way that plants use chemicals and sunshine to grow makes them special. The world's supply of basic foodstuffs is produced via the process of photosynthesis.
What are the biological benefits of plants?
The biosphere as a whole depends on plants for food and oxygen, literally supporting life as we know it. Additionally, they offer the human race with important resources including food, clothing, fuel, and medicines.
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Complete question
A horticulturalist wants to produce geraniums with specific characteristics. She knows that the trait of red flowers is governed by the allele R (RR and Rr) and the trait of white flowers is governed by the allele r (rr).
The horticulturalist has a red geranium with an uncertain genetic makeup. She crosses it with a white geranium (rr) and gets a generation in which half of the plants have red flowers and half have white flowers. What does this combination of offspring tell her about the genetic makep of the red geranium parent?
a. The red geranium is heterozygous for red flowers (Rr).
b. The red geranium is homozygous for red flowers (RR).
c. The trait shows incomplete dominance.
d. The red geranium is homozygous for white flowers (rr).
