In tomatoes, tall plant (D) is dominant over dwarf plant (d) and smooth fruit (H) is dominant over hairy fruit (h). A farmer crosses tall plant that produces smooth tomatoes (plant A) with a dwarf and hairy fruit plant (plant B) and obtains the following results:                                                         Phenotype                                           Offspring                                                Tall & smooth fruit                                      3 Tall and hairy fruit                                     84 Dwarf and smooth fruit                             88 Dwarf & hairy fruit                                      4   What is the map distance between the D and H alleles?   13.7 mu 14 mu 3.9 mu 17.2 mu 24.6 mu

Suppose that the wild type phenotype for tomatoes is red, round fruit with three-parted leaves and that a strain of mutant tomatoes has yellow, pear-shaped fruit with entire leaves. A and a represent the alleles for fruit color, B and b represent the alleles for fruit shape, and C and c the leaf shape. Two tomatoes with the genotypes Aa Bb cc and Aa Bb CC are crossed. The resulting Punnett square is shown. One cell has been completed with the correct tomato phenotype. Fill in the rest of the Punnett square by placing a fruit and leaf phenotype in each cell. ABC AbC aBC abC ABC Abc aBc abc Answer Bank

The trait for medium-sized leaves in iris is determined by the genetic condition PP'. Plants with large leaves are PP, whereas plants with small leaves are P'P'. The trait for red flowers is controlled by the genes RR, pink by RR', and white by R'R'. A cross is made between two plants each with medium-sized leaves and pink flowers. If they produce 640 seedlings, what would be the expected phenotypes, and in what numbers would they be expected?

The best way to determine the genotype for a plant presenting with dominant phenotypes is by performing a test cross. Test crosses are always performed with a true-breeding plant with recessive traits. What would be the phenotype and genotype of the plant you would need to perform the test-cross with your tall, purple plant?After performing the test-cross with your unknown purple, tall plant you find that all your resulting plants are tall; half have white flowers, and half have purple flowers. What was the genotype of your original purple, tall plant?

The following results were obtained from a dihybrid cross between two pea plants:   315 plants with round seeds and yellow flowers 101 plants with wrinkled seeds and yellow flowers 108 plants with round seeds and white flowers 32 plants with wrinkled seeds and white flowers   Assume that round seeds and yellow flowers are dominant and both parent plants were heterozygous for both traits.

In tomatoes, tall (D) is dominant over dwarf (d) and smooth fruit (P) is dominant over pubescent fruit (p), which is covered with fine hairs. A farmer has two tall and smooth tomato plants, which we will call plant A and plant B. The farmer crosses plants A and B with the same dwarf and pubescent plant and obtains the following numbers of progeny: Q. Explain why different proportions of progeny are produced when plant A and plant B are crossed with the same dwarf pubescent plant.

A geneticist is using a three‑point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait, b is associated with buckled wings, and c is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. From this data, calculate the map distance between b and c.   progeny curved    277 anomalous, buckled  283 wild type     5 anamalous, buckled, curved     5 buckled, curved      133 anomalous        127 anomalous, curved     86 buckled       84

After a cross between two corn plants, the F₁ plants all had a dwarf mutant phenotype. The F2 consisted of 1,207 dwarf plants and 401 tall plants. Identify the phenotypes and genotypes of the two parents. O d/d (dwarf), D+/d (tall) D/D (dwarf), d+/d+ (tall) D/D (dwarf), D+/D+ (tall) d/d (dwarf), d+/d+ (tall)

A homozygous variety of opium poppy (Papaver somniferum Laciniatum) with lacerate leaves was crossed with another homozygous variety with normal leaves. All the F₁ had lacerate leaves (jagged-edged leaves). Two F₁ plants were crossed to produce the F2. Of the F2, 249 had lacerate leaves and 16 had normal leaves. How are lacerate leaves determined in the opium poppy? two genes, with a dominant allele at both loci two genes, where one allele at a single locus is recessive lethal one gene, with codominant alleles at a single locus two genes, with a dominant allele at either or both loci Give genotypes for all the plants in the P, F₁, and F2 generations. Some generations will have more than one genotype. P F₁ F₂ (lacerate) F₂ (normal) aabb A_B_ Answer Bank aaB AaBb A_bb AABB

Fine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recessive traits in cucumbers. A cucumber plant heterozygous for all three traits is used in a test cross, and the following progeny are produced from this test cross. Type Number SU TU su Tu Su Tu su tu SU tu s U tu s U Tu Su tu TOTAL 2 70 21 4 82 21 13 17 230 Identify the order of the genes on the chromosome: