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Examen
Earth and Life Sciences Exam with Questions and Answers 
 

NuevoEarth and Life Sciences Exam with Questions and Answers 
 
A geneticist crosses two heterozygous pea plants for seed color, where yellow (Y) is dominant over green (y). What is the probability that an offspring will have green seeds? 
a. 25% 
b. 50% 
c. 75% 
d. 100% 
Correct Answer: a. 25% 
Rationale: Crossing Yy × Yy produces genotypes YY, Yy, Yy, and yy. Only yy expresses the recessive green phenotype, representing 1 out of 4 offspring or 25%. 
 
A fisheries manager increases the fish harvest...