Assume That in Watermelon Plants the Genes for Flower Color

question 9

Multiple Choice

Assume that in watermelon plants the genes for flower color (Y = yellow;y = orange flowers) and fruit shape (R = round;r = oval) are on the same chromosome.You cross two true-breeding plants,one with yellow flowers and round fruit and the other with orange flowers and oval fruit.You take one of the F₁ individuals and cross it with a plant that is homozygous recessive for both traits.You get the following in the F₂: 300 yellow flowers,round fruit;300 orange flowers,oval fruit;100 yellow flowers,oval fruit,100 orange flowers,round fruit.
The recombination frequency observed in experimental crosses can be used to indicate distances between genes on a chromosome.More specifically,the map distance between two genes is equal to the frequency of recombinant offspring.What is the map distance between the genes for flower color and fruit shape?

• A)25.0
• B)4.0
• C)40.0
• D)33.0
• E)100.0

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