Letter D 3832 E01-Homework week #5 1. In the ADABarba plant the synthesis of pin
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Letter D
3832 E01-Homework week #5 1. In the ADABarba plant the synthesis of pink pigment in the petals is controlled by two genes, S and K. (Unless told otherwise, you can always assume that all other genes in a pathway are homozygous WT in these individuals.) The pathway is.. gene SA enzyme genek enzyme yellow pigment green pigment a. If a pure breeding plant was unable to catalyze the first reaction, what color of petals would you expect to see? yez b. If a pure breeding plant was unable to catalyze the second reaction, what color of petals would you expect to see? gin c. If the plants from parts a and b were crossed, what color petals will these F1 offspring plants have?n d. What would be the expected phenotypic ratios in a cross between F1 plants? Make sure you include phenotypic class information with your ratios. 2. You're a beta fish breeder and have noticed that you have a few fish that display a totally novel ruby red coloring pattern. This ruby red color has since become is very popular in your Etsy store, but you are STRUGGLING to develop a purebreeding strain. Like, every time two ruby red betas are crossed, you end up with a fair number of ruby reds, but still a significant number of betas featuring the standard-type coloration. In your most recent ruby red x ruby red mating attempt, you ended up with 57 ruby red betas and 28 standard betas. All other such matings gave similar phenotypic offspring ratios. Explain what's going on here. (Explanation / Answer
Q1. a) If a pure breeding (ssKK) plant was unable to catalyse the first reaction, it means that yellow pigment cannot be converted to green pigment. Therefore the colour of the petals remain as Yellow in colour.
b) Here a pure breeding plant (SSkk) is not able to catalyse the second reaction. ie; the yellow pigment has been converted to green in colour but the green pigment cannot be converted to pink colour. So, the petals of the plant remains as green in colour.
c) The cross between above two plants can be represented as,
ssKK X SSkk
SsKk - which is dominant for both the genes. so, the colour of the pigment will be Pink in colour.
d) The cross between F1 plants can be represented as follows :
c SsKk X SsKk
The phenotypic ratios are 9 Pink : 3 Green : 4 Yellow
SK Sk sK sk SK SSKK - Pink SSKk - Pink SsKK -Pink SsKk -Pink Sk SSKk -Pink SSkk -Green SsKk - Pink Sskk - Green sK SsKK -Pink SsKk -Pink ssKK - Yellow ssKk -Yellow sk SsKk -Pink Sskk - Green ssKk -Yellow sskk -YellowRelated Questions
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