In a particular plant, three independently assorting genes ( Aa, Bb, Cc ) influe

Question

In a particular plant, three independently assorting genes (Aa, Bb, Cc) influence height, such that each dominant allele adds 4 cm to a base height of 2 cm. The recessive alleles do not add any height. You crossed a AABBcc plant with a AAbbCC plant.

Part A How tall are the F1 plants?

Part B If the F1 plants are crossed, how many different heights would be observed among the F2 progeny?

Enter your answer as a single whole number (not word).   cm

What would be the phenotypic ratio among the F2?Enter your answer as whole numbers separated by colons, without any spaces. Do not include any phenotypes or genotypes, but arrange your ratio from shortest to tallest (left to right). For example, for a hypothetical 9:3:3:1 ratio, 9/16 would represent the shortest plants and 1/16 would represent the tallest plants.

Explanation / Answer

AABBcc x AAbbCC

F1 shows all heterozygous AaBbCc offsprings

base height = 2cm

addition of height by each dominant allele =4 cm = 4 x 3 = 12+2 =14cm

PART A: The height produced by the parental cross in F1 plants = 14 cm

PART B: 7

PART C: 7 different phenotypic classes in the F2 among the 64 possible combinations of the 8 types of F1 gametes.

1/64:6/64:15/64:20/64:15/64:6/64:1/64

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