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In tomatoes, round fruit is dominant over elongated fruit, and smooth skin is dominant over fuzzy or peach skin. An RS/rs plant is test-crossed and 1000 progeny are obtained. If the genes have a frequency of recombination of 26%, how many will be elongated and peach skin?
| A. |
370 |
|
| B. |
260 |
|
| C. |
130 |
|
| D. |
740 |
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- A gardener performs a monohybrid cross on two heterozygous orange-fruited tomato plants. Plants expressing the recessive phenotype yield yellow tomato fruits. What percentage of the offspring will produce yellow tomatoes? A-075% B-50% C-100% D-25%Imagine that you are performing a cross involving seed color in garden pea plants. What traits would you expect to observe in the F1 offspring if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. a. only yellow-green seeds b. only yellow seeds c. 1:1 yellow seeds:green seeds d. 1:3 green seeds:yellow seedsWhat is the reason for doing a test cross? a. to identify heterozygous individuals with the dominant phenotype b. to determine which allele is dominant and which is recessive c. to identify homozygous recessive individuals in the F2 d. to determine if two genes assort independently
- The phenotype of individuals heterozygous for ________ alleles comprises both homozygous phenotypes. a. epistatic c. pleiotropic b. codominant d. hybridHow can the order of three linked genes (A, B, and C) on the same chromosome be determined? A. Calculating the frequency of recombination between genes. B. Gene order cannot be determined by looking at the results of a cross. C. Look for parental phenotypes. D. Look for single-crossover phenotypes involving the wild-type and mutant alleles of genes A, B, and C.In a mendelian monohybrid cross, which generation is always completely heterozygous?A) F2 generationB)F1 GenerationC) F3 generation D) P generation
- Suppose that in barley plants, the allele for tall stalks is dominant over short stalks and the allele for wide leaves is dominant over thin leaves. What would be the best way to determine the genotype of a barley plant with a tall stalk and wide leaves? Choose 1 answer: A.Perform a testcross with a barley plant that has a tall stalk and thin leaves. B.Perform a testcross with a known heterozygous barley plant . C. Perform a testcross with a barley plant that has a short stalk and thin leaves. D. Perform a testcross with a barley plant that has a tall stalk and wide leaves.after crossing two tall pea plants, a scientist notes that approximately3/4 are tall, while approximately 1/4 are short. The scientist is noting the offspring' a. phenotypes b. genotypes c. wild types d. karyotypesGregor Mendel proposed the law of independent assortment based on the observation that dihybrid crosses of heterozygous individuals produced progeny in a 9:3:3:1 ratio. For this observation to hold, which assumption must be true? A. The traits are governed by genes on different chromosomes. B. The traits are governed by genes on the same chromosome. C. The traits are governed by genes with only two alleles. D. The traits are governed by genes with only three alleles.
- What does a Punnett square illustrate? A. The phenotypes of all offspring in a test cross. B. The genotypes of all possible offspring in a test cross. C. The phenotypes of all possible offspring in a test cross. D. The genotypes and phenotypes of all possible offspring in a test cross.Mendel also studied tall and short varieties of pea plants. When he crossed tall x short plants together, the F1were tall. The tall F1 plants were self-hybridized to produce the F2. What proportion of phenotypes would be expected in the F2? 1:2:1 tall:intermediate:short 3:1 tall:short 1:1 tall:short 3:1 short:tall 1:2:1 intermediate:tall:shortAssume independent assortment and start with a plantthat is dihybrid A/a ; B/b:a. What phenotypic ratio is produced from selfing it?b. What genotypic ratio is produced from selfing it?c. What phenotypic ratio is produced from testcrossingit?d. What genotypic ratio is produced from testcrossingit
