Answer :
Punnett squares are used to calculate probabilities of getting individuals with certain phenotypes and genotypes, and to infer the inheritance pattern (ie. complete dominance). 1) B is correct. RRxrr. 2) C is correct. RR and rr. 3) A is correct. 2 red to 2 white. 4) This cross suggests the red geranium is homozygous for red flowers (RR).
What are Punnett square and complete dominance?
The Punnett square is a graphic representation that shows the different types of gamete combinations according to the alleles involved in a cross.
Punnett square shows the probabilities of getting offspring with different genotypes and their consequent phenotypes.
Complete dominance is the inheritance pattern through which the dominant allele hides the expression of the recessive allele in heterozygous individuals. In these cases, the dominant phenotype is expressed.
In the exposed example,
- R is dominnat over r.
- RR and Rr code for red flowers, while rr codes for white flowers.
1) Cross: a geranium that is heterozygous for red flowers with a geranium that is true-breeding for white flowers.
Parentals) Rr x rr
Gametes) R r r r
Punnett square)
r r
R Rr Rr
r rr rr
F1) 50% of the plants are expected to be Rr and 50% rr
Option B is correct.
2) A cross of two geraniums that yields offspring 100% Rr involves homozygous dominant and recessive individuals.
RR and rr
Option C is correct.
3) From the cross Rr x rr, the offspring expresses the phenotypic ratio 2/4 Rr : 2/4 rr.
Option A is correct. 2 red to 2 white
4) Cross: Red with white
Parentals) R- x rr
F1) 100% Rr
This cross suggests the red geranium is homozygous for red flowers (RR).
You can learn more about punnett squares at
https://brainly.com/question/25357981
#SPJ1