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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 plans to cross a geranium that is heterozygous for red flowers with a geranium that is true-breeding for white flowers.
Which Punnett square best describes this cross?
Responses
A:
R r
R RR Rr
r Rr rr
B:
r r
R Rr Rr
r rr rr
C:
R r
R RR Rr
R RR Rr
Question 2:
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).
A cross of two geraniums yields offspring that are 100% Rr.
Which choice best represents the alleles of the parents?
Responses
A. RR and Rr
B. Rr and rr
C. RR and rr
D. Rr and Rr
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 crosses two geraniums from the F1 generation.
Look at the Punnett square to see this cross.
r r
R Rr Rr
r rr rr
Which ratio of red-to-white flowering plants would she expect to see in the phenotypes of the F2 generation?
Responses
2 red to 2 white
3 red to 1 white
1 red to 3 white
all red
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 all of the plants have red flowers.
r r
? Rr Rr
? Rr Rr
What does this combination of offspring tell her about the genetic makeup of the red geranium parent?
Responses
The red geranium is homozygous for white flowers (rr).
The red geranium is homozygous for white flowers , left parenthesis lowercase r r right parenthesis, .
The red geranium is heterozygous for red flowers (Rr).
The red geranium is heterozygous for red flowers , left parenthesis uppercase R lowercase r right parenthesis, .
The red geranium is homozygous for red flowers (RR).
The red geranium is homozygous for red flowers , left parenthesis uppercase R R right parenthesis, .
The trait shows incomplete dominance.
The trait shows incomplete dominance.
