In cucumbers, heart-shaped leaves (hl) are recessive to normal leaves (Hl) 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 36.4 m. u. apart. A standard testcross is set up between a Hl Ns / hl ns plant an a hl ns / hl ns plant. What percentage of the progeny would be expected to have heart-shaped leaves and few spines (hl, Ns)
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In cucumbers, heart-shaped leaves (hl) are recessive to normal leaves (Hl) and having numerous fruit...
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