7. I n pigeons, the checkered pattern results from the dominant gene B and p col

Question

7. I n pigeons, the checkered pattern results from the dominant gene B and p coloration on the recessive gene b. Red color is controlled by a dominante and by the brown r recessive gene. (a) A homozygous checkered, red bird and a plain, brown bird are crossed. Summarize the expected Fi and F2 results, giving both genotype and phent (b) Male checkered, red birds with the genotype BbRr were mated with of the following genotypes; (i) BBRR (i) Bbrr (i) bbrr. Summarize the expect first generation results of each cross, giving all ratios. females ted

Explanation / Answer

7a) Homozygous checkered red bird BBRR X plain brown bird bbrr

F1 generation

BbRr

Checkered red

BbRr

Checkered red

BbRr

Checkered red

BbRr

Checkered red

100% checkered red and BbRr

F2 generation

BbRr X BbRr

BBRR

Checkered Red

BBRr

Checkered Red

BbRR

Checkered Red

BbRr

Checkered Red

BBRr

Checkered red

BBrr

Checkered brown

BbRr

Checkered Red

Bbrr

Checkered brown

BbRR

Checkered Red

BbRr

Checkered Red

bbRR

Plain Red

bbRr

Plain Red

BbRr

Checkered Red

Bbrr

Checkered brown

bbRr

Plain Red

bbrr

plain brown

Checkered red : Checkered brown: Plain red: Plain brown= 9:3:3:1

b) i) BbRr X BBRR

BBRR

Checkered red

BBRR

Checkered red

BBRr

Checkered red

BBRr

Checkered red

BbRR

Checkered red

BbRR

Checkered red

BbRr

Checkered red

BbRr

Checkered red

100% checkered red

ii) BbRr X Bbrr

BBRr

Checkered red

BbRr

Checkered red

BBrr

checkered brown

Bbrr

checkered brown

BbRr

Checkered red

bbRr

plain red

Bbrr

checkered browm

bbrr

plain brown

Checkered red : Checkered brown: Plain red: Plain brown= 3:3:1:1

iii) BbRr X bbrr

BbRr

Checkered red

BbRr

Checkered red

Bbrr

Checkered brown

Bbrr

Checkered brown

BbRr

Checkered red

BbRr

Checkered red

bbrr

Plain brown

bbrr

Plain brown

Checkered red: Checkered brown: Plain brown = 2:1:1

br br BR

BbRr

Checkered red

BbRr

Checkered red

BR

BbRr

Checkered red

BbRr

Checkered red

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