In the dihybrid cross performed by Morgan the recombination types `37.2%` are found during study of

Options

A. yellow body and white eye in Drosophila
B. blue flower and long pollen in sweet pea
C. white eye and minature wing in Drosphila
D. Seed colour and seed shape in maize

Answer

To solve the question regarding Morgan's dihybrid cross and the recombination frequency of 37.2%, we can follow these steps:

### Step 1: Understand the Concept of Dihybrid Cross
A dihybrid cross involves two traits, where each trait is determined by a different gene. In this case, we need to identify the traits Morgan studied in his experiments.

**Hint:** Recall that a dihybrid cross examines the inheritance of two different traits simultaneously.

### Step 2: Identify Parental and Recombinant Types
In a dihybrid cross, the progeny can be classified into two categories: parental types (which resemble the parents) and recombinant types (which exhibit new combinations of traits). The recombination frequency indicates how often recombination occurs between the two genes.

**Hint:** Remember that parental types are the original combinations of traits from the parents, while recombinant types show new combinations.

### Step 3: Review Morgan's Experiments
Morgan performed experiments using fruit flies (Drosophila melanogaster) and discovered that certain traits were linked. He found that the recombination frequency was not always 50% due to gene linkage, which affects how traits are inherited together.

**Hint:** Think about the specific traits Morgan studied in his experiments with fruit flies.

### Step 4: Analyze the Given Recombination Frequency
The question states that Morgan found a recombination frequency of 37.2%. This indicates that the genes for the traits he studied were linked but not completely, leading to a lower frequency of recombination than expected under independent assortment.

**Hint:** Recall that a recombination frequency of less than 50% suggests linkage between the genes.

### Step 5: Identify the Correct Traits
The traits that Morgan studied with a recombination frequency of 37.2% were the white eye color and miniature wing size in fruit flies. This linkage caused the observed recombination frequency to be lower than expected.

**Hint:** Look for the specific traits associated with Morgan's findings on linkage and recombination.

### Conclusion
The correct answer to the question is that the recombination frequency of 37.2% was found in Morgan's study of the traits for white eyes and miniature wings in Drosophila melanogaster.

**Final Answer:** Option C: White eye and miniature wing.