1. Fill in the Punnett square to show the results of a monohybrid cross between heterozygous (Tt) tall pea plants. What is the phenotypic ratio of dominant (tall) to recessive (short) traits in this cross? 2. Fill in the test cross on a tall pea plant with an uncertain genotype (T?) with a homozygous short plant (tt) to show the two possible outcomes. T T t t t t t 3. Fill in the dihybrid cross on pea plants that are heterozygous for round, yellow seeds and independent assortment is assumed. Seeds can be yellow (dominant) or green (recessive) and round (dominant) or wrinkled (recessive). What are the phenotypes and the phenotypic ratio of the offspring for this dihybrid cross?
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Step 1: For the monohybrid cross between heterozygous (Tt) tall pea plants, the Punnett square would look like this: \[ \begin{array}{|c|c|c|} \hline & T & t \\ \hline T & TT & Tt \\ \hline t & Tt & tt \\ \hline \end{array} \] Show more…
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In pea plants, tall (T) dominant over short (t), and round seed (R) is dominant over wrinkled seed (r). A homozygous tall plant that is also heterozygous for round seeds is crossed with a heterozygous tall plant that is also heterozygous for round seeds. Show all of your work! a. Give the genotypes of each parental plant: b. What are the possible gametes for each parental plant? Do a Punnett square to determine. c. Use a Punnett square to cross the gametes in part b to determine the expected offspring, then answer the questions below.
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