Two pink-flowered four-o’clock plants were crossed to each other.What is the probability that a group of six offspring from this cross willbe composed of one pink-, two white-, and three red-flowered plants?

Suppose a purple flower heterozygous for stem size is crossed with a large stem (dominant) purple flower. What are the possible genotypes and phenotypes of offspring?

The oval shaped pollen is dominant to round shape pollen. However, the oval shape character has only 35% penetrance. When a heterozygous oval shaped pollen plant is crossed with a homozygous round shape pollen plant, what is the probability that the first pollen produced will be round shape?

In tomato plants, tall vine (D) is dominant over dwarf vine (d) and round fruit (O) is dominant over oval-shaped fruit (o). Two tall, round-fruit shape plants (plants 1 and 2) are crossed with dwarf, oval-shape fruit plants. The results are as follows: i)  Why is there a difference in the proportionate number of plants in each phenotypic class of the offspring resulting from test crosses of plants 1 and 2?   (ii)  Calculate the recombination frequency between the genes D/d and O/o in tomatoes.  (iii)  Draw a chromosome map for these genes. (Use underscore (_) to draw the line for the map)

The probability that both alleles in the offspring are type A is the product of the probability that the allele from the pollen is A and the probability that the allele from the ovule is A (we will derive this in Section 6.5). What is the probability that the offspring of a homozygous parent is homozygous? What is the probability that the offspring of a homozygous parent is heterozygous?

Many of the color varieties of summer squash are determined by two different interacting genes A and B: AA or Aa gives white colored squash, aaBB or aaBb gives yellow squash, and aabb produces green squash.  A plant producing white squash is self-crossed. Three fourths of the offspring produces white squash; one fourth produces green squash. What is the genotype of the parent plant producing white squash?

Imagine you are crossing two plants that have these two genotypes—Tt and tt. What are the two genotypes of the gametes that the Tt plant can make? What is the one genotype of the gametes that the tt plant can make? Set up a Punnett square to analyze the cross. Does the Punnett square need to have four boxes or just two? If you were crossing a TT plant with a tt plant, how many boxes would be necessary in a Punnett square?

In Figure 4-6, why does the diagram not show meiosesin which two crossovers occur between the same twochromatids (such as the two inner ones)?

11:34 Make the following Punnett square. RrYYTT x rrYytt 8*8 or 64 squares. Use a blank sheet as needed. What is the phenotypic ratio of the offspring? Your gametes: 1-3-5; 1-3-6; 1-4-5; 1-4-6; 2-3-5; 2-3-6; 2-4-5; 2-4-6;

If a pink snapdragon is crossed with a red snapdragon, what phenotypes can result, and what is the probability of each phenotype?