Concept explainers
A geneticist crosses a pure-breeding strain of peas producing yellow, wrinkled seeds with one that is pure-breeding for green, round seeds.
a. Use a Punnett square to predict the
b. What proportion of the
c. What is the expected
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- Fruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly. a. Draw the Punnett square. b. What is the genotyoe ratio of the offspring? c. What is the phenotype ratio of the offspring? d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)arrow_forwardshows the results of a cross between a tall pea plant and a short pea plant. a. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the short parent? b. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the tall parent?arrow_forwardThe following cross is conducted between varieties of corn plants that exhibit the following phenotypes ... X Yellow and wrinkled kernels: ddrr Purple and smooth kernels: DdRr *The alleles for these traits assort independently during gametogenesis a. Using a Punnett square, determine the expected phenotypic ratio among the offspring of this cross. b. If this cross produces 425 offspring, how many are expected to phenotypically resemble the first parent? c. If this cross produces 425 offspring, how many are expected to exhibit a recombinant phenotype?arrow_forward
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