Female fruit flies with normal wings were crossed to males with malformed \"cut\

Question

Female fruit flies with normal wings were crossed to males with malformed "cut" wings. The F1 progeny were: 1/4 normal females 1/4 cut-wing females 1/4 normal males 1/4 cut-wing males State the mode of inheritance that can explain these results, and the genotypes of the parents. The normal F1 female progeny from the cross in (a) were crossed to the normal F1 males. The resulting F2 progeny were: 1/2 normal females 1/4 normal males 1/4 cut-wing males What is the mode of inheritance of cut wing, and what were the genotypes of the parents, F1, and F2? Bar-eyed female fruit flies were crossed to normal males. The F1 progeny were: 1/4 normal females 1/4 bar-eyed females 1/4 normal males 1/4 bar-eyed males The normal F1 female progeny were crossed to the bar-eyed F1 males. The F2 progeny were: 1/2 bar-eyed female, 1/2 normal male. Explain the results. Your explanation should state the mode of inheritance and give the genotypes of all the flies. Female flies with club feet were crossed with normal males. The progeny were: 312 normal females 321 normal males 304 club-foot females Explain the results. Your explanation should state the mode of inheritance and give the enotypes of all the flies.

Explanation / Answer

)

Female fruit flies with normal wings were crossed to males with malformed "cut" wings. The F1 progeny were:

1/4 normal females

1/4 cut-wing females

1/4 normal males

1/4 cut-wing males

State if each of the following modes of inheritance can explain these results, and if so, what the genotypes of the parents must be.

(

Cut wing is X-linked recessive

It is X-linked recessive mode of inheritance.

XC=normal wing;

Xc=cut wing

XCXc (Normal female)

XC Xc (Normal female)     x   Xc Y

Xc

Y

XC

Xc XC

Y XC

Xc

Xc Xc

XcY

1/4 normal females------------- Xc XC

1/4 cut-wing females-------- Xc Xc

1/4 normal males-------------- Y XC

1/4 cut-wing males------------ Xc Y

)

Female fruit flies with normal wings were crossed to males with malformed "cut" wings. The F1 progeny were:

1/4 normal females

1/4 cut-wing females

1/4 normal males

1/4 cut-wing males

State if each of the following modes of inheritance can explain these results, and if so, what the genotypes of the parents must be.

(

Cut wing is X-linked recessive

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