7. In pigeons, results from the dominant gene B and plain Red color is controlle
ID: 273660 • Letter: 7
Question
7. In pigeons, results from the dominant gene B and plain Red color is controlled by a dominant and by the brown (a) A homozygous checkered, red bird and a plain, brh genotype and Summarize the expected Fi and Fz results, giving (b) Male checkered, red birds with the genotyemmarize of the following genotybesh cs m r recessive ee r recessive gene crossed. , brown are females BbRr were mated with females first generation results of each cross, giving all ratios. 8. A rooster with gray feathers is mated with a hen of the same phenotype Among their offspring, 15 chicks are grey,6 the simplest explanation for the inheritance of color in the chicks? What offspring would you expect from are black, and 8 are white. What is the mating of a grey rooster and a black hen? 9. A black guinea pig crossed with an albino guinea pig produces 12 black offspring. When the albino was crossed with a second black one, 7 blacks and 5 albinos resulted. What is the best explanation for these results. Give genotypes for parents and all offspring as well as the inheritance patten.Explanation / Answer
7)a. The genotype of homozygous checkered with red bird - BBRR.
The genotype of homozygous plain with brown bird - bbrr.
Cross between BBRR X bbrr.
Gametes formed BR br
F1 generation BbRr(checkered with red bird) X BbRr
Gametes formed BR, Br, bR and br BR, Br, bR and br.
F2 generation:
The Phenotypic ratio = 9:3:3:1.
Checkered with red bird = 9.
Checkered with brown bird = 3.
Plain with red bird = 3.
Plain with brown bird = 1.
The genotypic ratio = 1:2:2:4:1:2:1:2:1.
b. Genotype of male checkered with red birds - BbRr.
Cross between i) BbRr X BBRR.
Gametes formed BR, Br, bR and br BR.
Next generation:
The All are checkered with red birds.
The genotypic ratio = 1:1:1:1.
ii)Cross BbRr X Bbrr
Gametes formed BR, Br, bR and br Br and br.
Next generation:
The phenotypic ratio = 3(Checkered with red bird):3(Checkered with brown bird):1(Plain with red bird):1(Plain with brown bird).
The genotypic ratio = 1:2:1:1:2:1.
BBRr - 1.
BbRr - 2.
BBrr - 1.
Bbrr - 2.
bbRr - 1.
bbrr -1.
iii) Cross BbRr X bbrr.
Gametes formed BR, Br, bR and br br
Next generation
The phenotypic ratio = 1:1:1:1.
Checkered with Red bird - 1.
Checkered with brown bird - 1.
Plain with Red bird -1.
Plain with brown bird - 1.
The genotypic ratio = 1:1:1:1.
BbRr - 1.
Bbrr - 1.
bbRr - 1.
bbrr - 1.
Male/Female BR Br bR br BR BBRR(checkered with red bird) BBRr(checkered with red bird) BbRR(checkered with red bird) BbRr(checkered with red bird) Br BBRr(checkered with red bird) BBrr(checkered with brown bird) BbRr(checkered with red bird) Bbrr(checkered with brown bird) bR BbRR(checkered with red bird) BbRr(checkered with red bird) bbRR(plain with red bird) bbRr(plain with red bird) br BbRr(checkered with red bird) Bbrr(checkered with brown bird) bbRr(plain with red bird) bbrr(plain with brown bird)Related Questions
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