In a flowering plant, gene "a" encodes an enzyme responsible for the presence of dots on the flowers’ petals. a1, a2, and a3are the three known alleles of this gene; a1 is the wild type, a2 is a null allele, while a3 has a mutation in the promoter region of the gene, which results in the synthesis of very little gene product.

if the "a" gene is haploinsufficient, what is the predicted phenotypic ratio in the f1 of a cross between a wild type and a a2/a3 heterozygous plant ? ( include your explanation)

1.
100% of the f1 plants will have flowers with dots.

2.
25% of the f1 plants will have flowers with dots, and 75% will have flowers with no dots

3.
50% of the f1 plants will have flowers with dots, and 50% will have flowers with no dots.

4.
50% of the f1 plants will have flowers with a few dots, 25% will have flowers with normal amounts of dots, and 25% will have flowers with no dots.

5.
100% of the f1 plants will have flowers with no dots.