Question

In radishes, one gene governs fruit shape, with the phenotypes long, round, or oval, and another independently assorting gene governs color, either red, white, or purple. You cross a long, white variety with a round, red one and obtain an oval, purple F1. The F2 show nine phenotypic classes as follows: 9 long, red 15 long, purple 8 long, white 19 oval, red 32 oval, purple 16 oval, white 16 round, purple 8 round, white 9 round, red. What is the most likely pattern of inheritance for the two characters? W C70 782

Answer 1

Let allele for long be L and for round be l

And for red color R and white color r

Parents Long White x Round Red

LLrr x llRR

F1 Progeny LlRr Oval Purple

So here it is incomplete dominance of Mendelian inheritance.

Here the offspring is neither similar to any of the parents.

In heterozygous genotype, both the characters that is dominant and recessive characters are partially expressed.

now, LlRr x LlRr

gametes LR Lr lR lr

	LR	Lr	lR	lr
LR	LLRR	LLRr	LlRR	LlRr
Lr	LLRr	LLrr	LlRr	Llrr
lR	LlRR	LlRr	llRR	llRr
lr	LlRr	Llrr	llRr	llrr

As here the incomplete dominance takes place

phenotypes can be as follows:

• Long Red    (LLRR)    1
• Long Purple    (LLRr)    2
• Long White (LLrr)    1
• Oval Red    (LlRR) 2
• Oval Purple (LlRr) 4
• Oval White    (Llrr) 2
• Round Red    (llRR) 1
• Round Purple (llRr)    2
• Round White    (llrr) 1

Ratio of phenotype is 1:2:1:2:4:2:1:2:1

Thus this is similar to the cross done with radishes.

Hope you understood.

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