purple flowers are dominant over white flowers. a heterozygous purple flower is crossed with another…
purple flowers are dominant over white flowers. a heterozygous purple flower is crossed with another heterozygous purple flower. what will the ratio of purple to white be?\no 3:1\no 1:3\no 2:2\no 4:0
Answer
Explanation:
Step1: Define alleles
Let (P) represent the dominant allele for purple flowers and (p) represent the recessive allele for white flowers. A heterozygous purple - flowered plant has the genotype (Pp).
Step2: Set up the Punnett - square
When two (Pp) plants are crossed, the possible gametes from each parent are (P) and (p). The Punnett - square has 4 boxes. The combinations are (PP), (Pp), (pP) (which is the same as (Pp)), and (pp).
Step3: Determine phenotypes
(PP), (Pp), and (pP) result in purple flowers (since the presence of the dominant (P) allele masks the recessive (p) allele), and (pp) results in white flowers. So, there are 3 purple - flowered genotypes ((PP), (Pp), (Pp)) and 1 white - flowered genotype ((pp)).
Answer:
A. 3:1