You arrive in the newly established country of Farmworldia, where agriculture is

Question

You arrive in the newly established country of Farmworldia, where agriculture is the major economic engine and most citizens have done a little plant breeding. They show you two different, true-breeding varieties of some fruit they call “loomoo.” The first variety has green skin and sour flesh along with inedible seeds. The second variety has purple skin and bitter flesh along with edible seeds.

(a) What are the characters that differ between the two loomoo varieties?

(b) Given that green skin, sour flesh, and edible seeds are all recessive traits, propose a genotype for each of the two loomoo varieties. Put an “X” in the genotype for any alleles that you think cannot be determined.

(c) In conversation, you learn that a purple-skinned, bitter-fleshed variety with inedible seeds is known, but they are undesirable and fed to pigs. People say it’s no use to cross the two true-breeding varieties (unless you want to sell a lot of pork) because you only get this “foul loomoo” from the progeny. What is the genotype of foul loomoo (use “X” for any unknown genes)?

Explanation / Answer

A - Skin colour - Green skin colour and purple skin colour

Flesh taste- Sour flesh and bitter flesh

Seeds- Edible seed and inedible seed

B-

The purple colour is P and the green colour is p

Bitter flesh be B and sour flesh be b

Inedible seed be I and edible seed be i

Since both, the varieties are pure than means that alleles are in homozygous condition

The genotype of  green skin, sour flesh, and edible seeds is ppbbii

The genotype of purple skin and bitter flesh along with edible seeds. is PPBBII

C- When we cross both the true variety we will get the progeny which have the given genotype.

PPBBII crossed with ppbbii

gamete from PPBBII is PBI

gamete from ppbbii is pbi

So the genotype of progeny will be PpBbIi

and the progeny will show phenotype - purple skin and bitter flesh along with edible seeds p

So the genotype of foul loomoo will be PpBbIi or P_B_I_

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