vas are represented? b. What is the largest number of different Seven pected t.
ID: 143668 • Letter: V
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vas are represented? b. What is the largest number of different Seven pected t. How do you that could be associated with any one Is there any phenotype that could be rept this incompa g. Explain wh of new inc creasing)y or petun lants only a single genotype? c. In a particular field, you find that the laree ity of clover plants lack a pattern on their even though you can identify a few plants 17. In a specie black vari montezu ezuma a n the and ld be llele sentative of all possible pattern types. Explain finding. color. zuma 15. Fruit flies with one allele for curly wings (Cy one allele for normal wings (Cy) have curly a- he d be e al n- in When two curly-winged flies were crossed, 203 curly-winged and 98 normal-winged flies were obtained. In fact, all crosses between curly-winged flies produce nearly the same curly: normal ratio among the progeny. a. What is the approximate phenotypic ratio in these offspring? b. Suggest an explanation for these data. c. If a curly-winged fly was mated to a normal- at winged fly, how many flies of each type would you expect among 180 total offspring? eny 16. In certain plant species such as tomatoes and petu- nias d highly polymorphic incompatibility genes with more than 100 known alleles prevents self-fer tilization and promotes outbreeding. In this form of incompatibility, a plant cannot accept sperm carry- ing an allele identical to either of its own incompat- ibility alleles. If, for example, pollen carrying sperm with allele S of the incompatibility gene lands onto the stigma (a female organ) of a plant that also carries the S allele, the sperm cannot fer- e any eggs in that plant. (This phenomenon nollen grain on the stigma cannotExplanation / Answer
Step 1 of 3
The approximate phenotypic ratio in these offspring is 2/3 Curly (Cy): 1/3 normal (Cy+)
Step 2 of 3
The expected result of this cross is
Cy/Cy X Cy+/Cy = ¼ Cy/Cy: ½ Cy+/Cy (Curly): ¼ Cy+/Cy+ (normal).
When Cy/Cy is recessive lethal, the observed phenotypic ratio will be 2/3 Curly: 1/3 normal.
Step 3 of 3
The progeny of the Cy+/Cy X Cy+/Cy+ cross will be 90 curly winged flies and 90 normal winged flies
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