*17. In cucumbers, heart-shaped leaves (hl) are recessive to normal leaves (HI)

Question

*17. In cucumbers, heart-shaped leaves (hl) are recessive to normal leaves (HI) and having numerous fruit spines (ns) is recessive to having few fruit spines (Ns). The genes for leaf shape and for number of spines are located on the same chromosome; findings from mapping experiments indicate that they are 32.6 m.u. apart. A cucumber plant having heart-shaped leaves and numerous spines is crossed with a plant that is homozygous for normal leaves and few spines. The F are crossed with plants that have heart-shaped leaves and numerous spines. What phenotypes and phenotypic proportions are expected in the progeny of this cross?

Explanation / Answer

There are four combinations of progenies possible in the F2 generation of this cross.

a. Hlhl,Nsns - Normal leaves with few fruit spines

b. Hlhl,nsns - Normal leaves with numerous fruit spines

c. hlhl,Nsns - Heart shaped leaves with few fruit spines

d. hlhlnsns- Heart shaped leaves with numerous fruit spines

These four phenotypes can be observed in a ratio of 1:1:1:1

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