A cross between two pea plants that are hybrid for a single trait produces 60 offspring. Approx- imately how many of the offspring would be expected to exhibit the recessive trait? (1) 15 (2) 45 (3) 30 (4) 60
Question
A cross between two pea plants that are hybrid for a single trait produces 60 offspring. Approx- imately how many of the offspring would be expected to exhibit the recessive trait? (1) 15 (2) 45 (3) 30 (4) 60
Solution
To determine the approximate number of offspring that would be expected to exhibit the recessive trait, we need to understand the concept of hybridization and the inheritance pattern of the trait in question.
In this case, the two pea plants are hybrid for a single trait. This means that one parent plant carries the dominant allele for the trait, while the other parent carries the recessive allele. The dominant allele will mask the expression of the recessive allele.
When two hybrid plants are crossed, there is a 25% chance that the offspring will inherit two recessive alleles and exhibit the recessive trait. This is because each parent plant can pass on either the dominant or recessive allele to their offspring.
Given that there are 60 offspring, we can calculate the approximate number of offspring expected to exhibit the recessive trait by multiplying the total number of offspring by the probability of inheriting two recessive alleles.
Approximately 25% of 60 is 15. Therefore, the expected number of offspring that would exhibit the recessive trait is approximately 15.
So, the correct answer is (1) 15.
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