Recall from the background information that purple kernels are dominant and yell
ID: 227178 • Letter: R
Question
Recall from the background information that purple kernels are dominant and yellow kernels are recessive. Also recall that smooth kernels are dominant and wrinkled kernels are recessive. The third corn ear was the result of crossing a male ear of corn with the following gametes: PpSs, with a female ear of corn with the same gametes: PpSs. This is represented by the Punnett square, below. Complete the Punnett square by writing the correct letters that correspond to each number indicated in the table (for example, PPSS or ppss).
PS
Ps
pS
ps
PS
1
2
3
4
Ps
5
6
7
8
pS
9
10
11
12
ps
13
14
15
16
Using the results from the Punnett Square in Question 15, answer the following question: In a population of 240 corn kernels, how many will have smooth kernel texture?
PS
Ps
pS
ps
PS
1
2
3
4
Ps
5
6
7
8
pS
9
10
11
12
ps
13
14
15
16
Explanation / Answer
The results of punnett square are
1. PPSS
2.PPSs
3. PpSS
4.PpSs
5.PPSs
6.PPss
7.PpSs
8.Ppss
9.PpSS
10.PpSs
11.ppSS
12.ppSs
13.PpSs
14.Ppss
15.ppSs
16.ppss
Now the smooth kernels being dominant, they will be expressed by genotypes, PPSS, PPSs, PpSS, PpSs, PPSs, PpSs, PpSS, PpSs, ppSS, ppSs, PpSs , ppSs
So probability is 12/16
So the number of smooth kernels will be (12/ 16) × 240
= 180
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