Question

if purple flowers are dominant in a plant and white flowers are recessive in that plant, then when purple - flowered plants with two dominant genes are mated with white - flowered plants with two recessive genes, the first generation of offspring should have
choose one option
a 100% white flowers
b 75% purple flowers and 25% white flowers
c 50% purple flowers and 50% white flowers
d 100% purple flowers

Explanation:

Let the dominant allele for purple flowers be \( P \) and the recessive allele for white flowers be \( p \). The purple - flowered plant with two dominant genes has the genotype \( PP \), and the white - flowered plant with two recessive genes has the genotype \( pp \). When we do a cross (mating) between \( PP \) and \( pp \), using the Punnett square method:

• The \( PP \) plant can only produce gametes with the \( P \) allele.
• The \( pp \) plant can only produce gametes with the \( p \) allele.
• When these gametes combine, all the offspring will have the genotype \( Pp \). Since the \( P \) allele is dominant, the phenotype (appearance) of all the offspring will be purple flowers. So the first generation of offspring should have 100% purple flowers.

Answer:

D. 100% purple flowers