Question

15. The gene for petal color in a flower has incomplete dominance, so that individuals with two Al alleles (AIAI) are black, individuals with two A2 alleles (A2A2) are white, and individuals with one of each allele (A1A2) are mottled. In a cross between two black flowers, what is the probability of getting a mottled offspring? (2 points) In a cross between a black flower and a mottled flower, what is the probability of getting a black offspring? (2 points) In a cross between two mottled flowers, if there are two offspring, what is the probability of getting one black offspring and one mottled offspring? (2 points) In a cross between two mottled flowers, if there are two offspring, what is the probability of getting one white offspring and one mottled offspring? (2 points) In a cross between two mottled flowers, if there are nine offspring, what is the probability of getting exactly three mottled offspring? (2 points)

Answer 1

Answer- As mentioned in the question, A1A1- black, A1A2- mottled, A2A2- white.

The 1st cross between black flowers probability of mottled -0.

The 2nd question, cross between black and mottled, probability of black offspring - 2/4 that is 50%

The 3rd cross between 2 mottled, one black offspring- 1/4 25%, one mottled offspring 2/4 50%

4th cross between 2 mottled, one white offspring- 0.5/2 that is 25%, one mottled offspring 1/2 that is 50% (2 offspring)

4th cross between 2 mottled, proobability of getting exactly 3 mottled offspring is 50%

The crosses of the following is attached in the pictures.

AYAIX ΑΣΑΙ • Au Black Al Al Al Al AIAL AI ALAI ALAI AIAZ X ALAZ . AL AZ AI AI AI AI AZ ALAI: A1A2: A2/A1A2A2A2 A2A2 =1:2 :1 1 Black = 1/4 (25%). mottled = 2/4 (50%) I White = 1/4 (25%) 2opperong 0.5 Black 2.250 1 mottled 4.5

Incomplete Dominance AIAL - Black A2A2 - White AIA2 - Bottled Mottled ALAXX ALAT ALAIX AIAZ AI A2 T AIAI: A1A2 AI AIAI ALAZ 2 2 2 Al ANI AIAZ 1 : 1 56% mottled (2/4) or 1/2 = Black flower

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