Home Chapter 3 Post-quiz: 3.2 Independent Assortment

Post-quiz: 3.2 Independent Assortment

For the information necessary in completing this quiz, refer to Web Tutorial 3.2 Independent Assortment and Section 3.3 Mendel’s Dihybrid Cross Generated a Unique F2 Ratio in your textbook.

This activity contains 10 questions.

In the following test cross [AaBb X aabb], what are the dimensions of the Punnett square used to determine the genotypes of the next generation?

 2 X 4 2 X 2 4 X 1 4 X 2 4 X 4

What genotype is present most often among the progeny (F2) of a dihybrid cross (AaBb X AaBb)?

 AABB AAbb AaBb AABb aabb

In the F1 dihybrid cross (WwGg X WwGg), what is the probability of obtaining an individual that is round, green, and true-breeding? (G = Yellow seed, g = green seed; W = round seed, w = wrinkled)

 9/16 3/16 1/2 1/4 1/16

How many different types of gametes can be formed by individuals of the genotype AaBbcc?

 Aa, Bb, cc ABc, Abc, aBc, abc ABc, Abc, aBc AaBbcc ABc, Abc

How many different types of gametes can be formed by individuals of the genotype AaBB?

 AB, aB A, a, B, B AaBB Aa, BB A, a, B

A pea plant that is true breeding (homozygous) for green round seeds is crossed with a plant that has yellow wrinkled seeds. The F1 progeny all have round green seeds. Predict the results of test crossing these F1 plants.

 9:3:3:1 1:2:0:0 1:0:0:0 1:1:1:1 1:3:1:3

In the following list of genotypes, how many are examples of heterozygosity, and which ones are they? AA, Aa, Gg, bb, BB, Bb, GG, Ww, ww, aa

 3 heterozygotes: AA, BB, GG 3 heterozygotes: bb, ww, aa 4 heterozygotes: Aa, Gg, Bb, Ww 6 heterozygotes: AA, bb, BB, GG, ww, aa All of them

Using the forked line method, determine the phenotypic ratios of the trihybrid cross AaBbCc X AaBBCC. What proportion of the progeny have the dominant phenotype for A, B, and C?

 1/16 9/16 2/16 (or 1/8) 8/16 (or 1/2) 12/16 (or 3/4)

Using the forked line method, determine the phenotypic ratios of the trihybrid cross AaBbCc X AaBBCC. What proportion of the progeny are aaBBCC?

 8/16 (or 1/2) 1/16 12/16 (or 3/4) 2/16 (or 1/8) 9/16

Using the forked line method, determine the phenotypic ratios of the trihybrid cross AaBbCc X AaBBCC. What proportion of the progeny are homozygous recessive at all loci?

 1/16 12/16 (or 3/4) 8/16 (or 1/2) 2/16 (or 1/8) none