How do you do these? Pea plants heterozygous for five characters (GgliYyRrT), po

Question

How do you do these?

Pea plants heterozygous for five characters (GgliYyRrT), pod color, pod shape, seed color, seed shape, and stem length, are allowed to self-pollinate (cross gametes within the same plant), and 76, 800 resulting seeds are planted. Green is dominant over yellow for pod color, Inflated is dominant over constricted for pod shape, Yellow is dominant over green for seed color, Round is dominant over wrinkled for seed shape, and Tall is dominant over short/dwarf for stem length. All of these genes assort independently. What number of these planted seeds would be predicted to grow into plants having short/dwarf stems with constricted, yellow pods bearing green, round seeds?(Make your line of reasoning clear and show all calculations for full credit. A research scientist discovers a new receptor that requires much more legend than originally suspected for full activation during reception. a) What type of receptor is this likely to be? Why? b) What energy storage molecule is likely to be critical in assisting with the full activation of this receptor? Why?

Explanation / Answer

7 Pea plants question.

Since the genes assort independently we can do the cross for each trait separately and find the ratios of each phenotype and then multiply these ratios of our "desired" traits together to get our answer.

Gg x Gg= 1 GG: 2Gg:1gg,

i.e 1/4 GG (green), 2/4 or 1/2 of Gg (green) and 1/4 of yellow pod colour. Since G is dominant, the ratio for a green pod colour would be 3/4 and for yellow pod colour 1/4.

Ii x Ii= 1 II: 2Ii: 1ii, i.e 1/4 II (inflated), 2/4 or 1/2 of Gg (inflated) and 1/4 of constricted pod shape. So for an inflated pod shape, the ratio would be 3/4 and for constricted pod shape 1/4.

Yy x Yy= 1 YY: 2 Yy: 1yy, i.e 1/4 YY(yellow), 2/4 or 1/2 of Yy(yellow) and 1/4 of green seed colour. So for yellow seed colour, the ratio would be 3/4 and for green seed colour 1/4.

Rr x Rr= 1RR: 2 Rr: 1 rr, i.e 1/4 RR(yellow), 2/4 or 1/2 of Yy(round) and 1/4 of constricted seed shape. Since R is dominant, the ratio for round seed shape would be 3/4 and for wrinkled seed shape 1/4.

Tt xTt= 1 TT: 2Tt: 1tt, i.e 1/4 TT(tall stems), 2/4 or 1/2 of Yy(tall stems) and 1/4 of short/dwarf stems. So for tall stems, the ratio would be 3/4 and for short/dwarf stems, 1/4.

So multiplying the ratios, we get

tt (short stems) x ii (constricted pods) x gg (yellow pod colour) x yy (green seed colour) x RR or Rr (round seed shape) = 1/4 x 1/4 x 1/4 x 1/4 x 3/4= 3/1024

Since 76800 plants were obtained, the number of plants that have the above features would be 3/1024 x 76800= 225 plants.

G g G GG (green) Gg(green) g Gg (green) gg (yellow)

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