In smileys, the shape of the eye is controlled by multiple alleles. The smileys
ID: 58193 • Letter: I
Question
In smileys, the shape of the eye is controlled by multiple alleles. The smileys pictured show the four possible phenotypes. It is known that the star and dot eyes are codominant and the square eyes are a recessive trait. a. Assign all possible genotypes to the above smileys. ( Use the ABO blood group in humans as a model). Use 'E' and 'e' to represent the dominant and recessive genes respectively. S = star-eyed, D = dot-eyed If a homozygous star-eyed smiley is crossed with a homozygous dot-eyed smiley what will all of their offspring look like? Give genotype and phenotype of the Fi. If the pair in the cross above were both heterozygous, what would their offspring look like and in what proportion? Give genotypes and phenotypes of the Fv If a starry-dot eyed smiley is crossed with a square eyed smiley, what type of eyes will their children have and in what proportion? Give genotypes and phenotypes of the Fv A cattleman has a roan (speckled red and white) colored bull on his ranch and some white cows, but he would like to have red cattle since they are worth more money. Red, white, and roan coloration are due a single locus with just two alleles. How could these 3 phenotypes be produced by 2 alleles? Can the rancher obtain a red animal by breeding the stock he has (in F1 or F2)?Explanation / Answer
6.
a. Genotypes ; SE ,DE ,Se,De , ee ,SD , where e represent the square eyes ,recessive .
b. Homozygous condtions ; SS crossed with the DD , offsprings will be genotype SD , phenotype is all are star eyed and dot eyed , 100 percent co dominant .
c. Heterozygous condition ; Se crossed with De , the offsprings will be 25 percent SD , 25 percent Se, 25percent De , 25 percent will be ee. phenotypes are , star/dot eyed SD ,25 percent will be star eyed , 25 percent is De , 25 percent is square eyed .
d. Starry dot eyed crossed with square eyed , phenotype three will be starry eyed and one will be square eyed [3;1] ratio .
7. a. multiple alleles . Roan -red and white crossed with white , as there one is codominant roan , there will be the 3 phenotypes produced by the two alleles
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