Question

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some cattle are polled (p) which is dominant to non - polled (p).
if a male heterozygous steer breeds a female non - polled cow, what are their chances of producing polled offspring? %
what is the genotypic ratio?
what is the phenotypic ratio?

Explanation:

Step1: Analizar el genotipo de los padres

El macho es heterocigoto (Pp) y la hembra es no polled (pp).

Step2: Usar la tabla de Punnett

La tabla de Punnett muestra que los posibles genotipos de la descendencia son Pp y pp.

Step3: Calcular la probabilidad de polled (fenotipo)

El alelo P es dominante. Los genotipos Pp (polled) y pp (no polled). Hay 2 Pp y 2 pp en la tabla. La probabilidad de polled (Pp) es $\frac{2}{4}=0.5 = 50\%$.

Step4: Determinar el genotipo ratio

Genotipos: 2 Pp y 2 pp. Ratio genotípico $1:1$ (Pp:pp).

Step5: Determinar el fenotipo ratio

Fenotipos: polled (Pp) y no polled (pp). Ratio fenotípico $1:1$ (polled:no polled).

Answer:

Chances of polled offspring: $50\%$
Genotypic ratio: $1:1$
Phenotypic ratio: $1:1$