A variety of squash may be long, round, or oval in shape. The color may be yello

Question

A variety of squash may be long, round, or oval in shape. The color may be yellow, green, or white. A
long, white variety crossed with a round, green one (both true-breeding) produces only oval, yellow F1's.
The F2 progeny segregated into nine phenotypic classes in the following numbers:

long, green 9 long, white 7
long, yellow 15 round, yellow 16
oval, green 16 round, white 7
oval, yellow 32 oval, white 16
round, green 9

Question A. How many allele pairs are involved?
Question B. Construct an appropriate genetic map.
Question C. How many true-breeding varieties of squash could be established?

Explanation / Answer

Part A:

The number of allele pairs is equal to eight.  

Eight different combinations of alleles are involved in the production of nine phenotypic classes.

       Part C:

       The true breeding varieties include long white, round green and oval yellow.

       Therefore, from the given phenotypes, a total of 3 true breeding varieties can be established.

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