ononybrid semng Onone of the answer options O 1:2:1 3:1

Figure 19.2 In plants, violet flower color (V) is dominant over white (v). If p = .8 and q = 0.2 in a population of 500 plants, how many individuals would you expect to be homozygous dominant (VV), heterozygous (Vv), and homozygous recessive (vv)? How many plants would you expect to have violet flowers, and how many would have white flowers?

More Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross: P1: AABBCCDDEE aabbccddee F1: AaBbCcDdEe (self-cross to get F2) What is the chance of getting an AaBBccDdee individual in the F2 generation?

Different populations of the tiny freshwater snails pictured in FIGURE 12.1 reproduce sexually, or asexually. Individuals of the sexual populations are diploid; those in asexual populations are diploid (3n, having three sets of chromosomes). Huge populations of asexual snails are disrupting ecosystems worldwide. Fertilizers and detergents contain a lot of phosphorus. So does DNA. Explain why you might expect to find more sexual snail populations in an unpolluted river, and more asexual ones in a river polluted by agricultural and urban runoff.

More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r). a. Parents: brown eyes, right-handed brown eyes, right-handed Offspring: 3/4 brown eyes, right-handed 1/4 blue eyes, right-handed b. Parents: brown eyes, right-handed blue eyes, right-handed Offspring: 6/16 blue eyes, right-handed 2/16 blue eyes, left-handed 6/16 brown eyes, right-handed 2/16 brown eyes, left-handed c. Parents: brown eyes, right-handed blue eyes, left-handed Offspring: 1/4 brown eyes, right-handed 1/4 brown eyes, left-handed 1/4 blue eyes, right-handed 1/4 blue eyes, left-handed

Refer to question 5. Assuming complete dominance, the F2 generation will show a phenotypic ratio of ________. a. 3:1 b. 9:1 c. 1:2:1 d. 9:3:3:1 Question No. 5 5. The offspring of the cross AA aa are ________. a. all AA b. all aa c. all Aa d. half are AA and half are aa

How many different offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits when the traits behave in a dominant and recessive pattern? How many phenotypes? 64 genotypes: 16 phenotypes 16 genotypes; 64 phenotypes 8 genotypes; 27 phenotypes 27 genotypes; 8 phenotypes

More Crosses with Pea Plants: The Principle of Independent Assortment In the following trihybrid cross, determine the chance that an individual could be phenotypically A, b, C in the F1 generation. P1: AaBbCc AabbCC

Assuming complete dominance, crosses between two dihybrid F1 pea plant, which are offspring from a cross AABBaabb, result in F2 phenotype ratios of ________. a. 1:2:1 b. 3:1 c. 1:1:1:1 d. 9:3:3:1

Figure 12.5 In pea plants, round peas (R) are dominant to wrinkled peas (r). You do a test cross between a pea plant with wrinkled peas (genotype rr) and a plant of unknown genotype that has round peas. You end up with three plants, all which have round peas. From this data, can you tell if the round pea parent plant is homozygous dominant or heterozygous? If the round pea parent plant is heterozygous, what is the probability that a random sample of 3 progeny peas will all be round?