Review+quiz+answers (1)

Review+quiz+answers (1) - Biological Sciences 101 Dr. Mark...

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Biological Sciences 101 Dr. Mark Sanders Summer Session 2011 Review Quiz Answers 1. The following mating occurs to produce F1: P: S L S L x S L S R F1: 1/2 S L S L and 1/2 S L S R Random crosses among the F1 can occur in three different ways; Frequency Mating Progeny 1/4 S L S L x S L S L 1/4 S L S L 1/2 S L S L x S L S R 1/4 S L S L 1/4 S L S R 1/4 S L S R x S L S R 1/16 S L SL 1/8 S L S R 1/16 S R S R Among the F2 progeny, 9/16 are long, 6/16 are oval, and 1/16 are round. 2. In this case, all F1 radishes are heterozygous S L S R . The cross of heterozygotes produces 1/4 S L S L , 1/2 S L S R , and 1/4 S R S R . A total of one-half the F2 progeny are homozygous. 3. This is a cross of two heterozygous pigs, each with the genotype Pp . The probability that the offspring show the dominant phenotype is 3/4 for each offspring. The probability that the first two are dominant is (3/4)(3/4) = 9/16. 4. This example indicates that there is approximately a 3:1 ratio between dominant (purple) and recessive (white) phenotypes among progeny of two dominant parental plants. The parental plant is heterozygous and the expected proportion of homozygous (true breeding) purple progeny
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This note was uploaded on 07/09/2011 for the course BIS 101 taught by Professor Simonchan during the Summer '08 term at UC Davis.

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Review+quiz+answers (1) - Biological Sciences 101 Dr. Mark...

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