Answer :
Final answer:
In the genetic cross of two geraniums that produces 100% rr offspring, the alleles of the parents must have been rr and rr. This is because the red flower trait in geraniums, denoted by rr, is recessive and only presents itself when both alleles are recessive (rr).
Explanation:
The question is related to the characteristics of offspring based on the genetic makeup of two parental geraniums, a topic that falls under the study of genetics in biology. The alleles governing the traits of red and white flowers in geraniums are represented by lowercase 'r' in your question. If two geraniums cross and yield offspring that are 100% rr, the parents' alleles must have been rr and rr.
The rationale for this conclusion is grounded in Mendelian genetics. According to Gregor Mendel's laws, diploid organisms that are homozygous for a gene have two identical alleles. T
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The red geranium has red flowers because of heterozygosity (Rr) therefore, option A is correct.
Give an illustration of heterozygosity.
You have a heterozygous genotype for that gene if the two versions are different. Having one gene for red hair and one allele for brown hair, for instance, would indicate that you are heterozygous for hair color. Which characteristics are expressed depends on how the two alleles interact.
What distinguishes homozygous from heterozygous genetic makeup?
In each of us, there are two alleles, or different versions, for each gene. You are considered homozygous for a gene when there are two similar copies of it. In contrast, the alleles in a heterozygous genotype are distinct. Every person with a recessive trait, like red hair or blue eyes, is homozygous for that gene.
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The complete question is;
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).
