The offspring of a cross between a plant with purple flowers and a plant with white flowers are 23 plants with purple flowers and 26 plants with white flowers. What are the genotypes of the parent plants
Well, it seems like these plants really know how to mix and match their flower colors! Let me put on my floral detective hat and solve this mystery for you.
Since the offspring from the cross have both purple and white flowers, we can assume that the purple flower plant (let's call it P) is dominant over the white flower plant (let's call it p). This means that plants with the genotype PP or Pp will have purple flowers, while plants with the genotype pp will have white flowers.
Now, let's analyze the data. We have 23 plants with purple flowers and 26 plants with white flowers among the offspring. Since all the offspring inherited one gene from each parent, we can use this information to deduce the genotypes of the parent plants.
Let's assume the genotype of the plant with purple flowers is PP, and the genotype of the plant with white flowers is pp.
When PP (purple) and pp (white) combine, the possible combinations for their offspring are Pp (purple) and Pp (white). Since we have 23 purple-flowered plants, we can deduce that there are 23 plants with the genotype Pp, which came from the cross between PP and pp.
Similarly, when Pp (purple) and Pp (white) combine, the possible combinations for their offspring are PP (purple), Pp (purple), pp (white). Since we have 26 white-flowered plants, we can conclude that there are 26 plants with the genotype pp, which also originated from the cross between PP and pp.
So, the genotypes of the parent plants are:
Plant with purple flowers: PP
Plant with white flowers: pp
Case solved, Watson!
To determine the genotypes of the parent plants, we can use a Punnett Square analysis based on the observed phenotypes (purple and white flowers) of their offspring.
Let's first assign some letters to represent the flower color alleles:
- P for the purple flower allele
- p for the white flower allele
Since all 23 plants have purple flowers, we can deduce that they must have the genotype PP or Pp. On the other hand, the 26 plants with white flowers must have the genotype pp.
Now, let's create a Punnett Square using these genotypes:
| P | p |
--------------
P |PP | Pp|
--------------
p |Pp | pp|
Since the offspring of the crossing were 23 plants with purple flowers and 26 plants with white flowers, we can infer that the 23 purple-flowered plants have the genotype PP, while the 26 white-flowered plants have the genotype pp.
Therefore, the genotypes of the parent plants are:
- The plant with purple flowers: PP
- The plant with white flowers: pp
To determine the genotypes of the parent plants, we need to understand the basic principles of genetics. In this case, we are dealing with flower color, where purple is dominant (P) and white is recessive (p).
Let's assign the genotypes of the parent plants as follows:
Plant with purple flowers: PP
Plant with white flowers: pp
When these two plants cross, they will produce offspring with the following possible combinations:
1. PP x pp: All offspring will be heterozygous with the genotype Pp and show the dominant purple phenotype. None of the offspring will have the homozygous recessive genotype pp.
2. Pp x Pp: This will result in a 1:2:1 ratio between homozygous dominant (PP), heterozygous (Pp), and homozygous recessive (pp) genotypes. You will also observe a 3:1 ratio between plants with purple (PP or Pp) and white (pp) flowers. However, this scenario doesn't match the given data you provided.
Based on the data you provided (23 plants with purple flowers and 26 plants with white flowers), it seems more likely that the parent plants have the genotypes Pp and pp, following scenario 1.
Therefore, the most probable genotypes of the parent plants are:
Plant with purple flowers: Pp
Plant with white flowers: pp