Answer:
dont know how much this will help or not
Part A: The mistake was made in Step 2, where the student incorrectly distributed the negative sign in front of the second term, 2(10y + 8x). They should have distributed the negative sign to each term inside the parentheses, giving -20y - 16x, but instead they distributed it only to the first term, giving -20y + 16x.
Part B: To correct the mistake, we can rewrite Step 2 as:
84x - 42y - 2(10y + 8x)
Now we can correctly distribute the negative sign to each term inside the parentheses:
84x - 42y - 20y - 16x
Combining like terms, we get:
68x - 62y
Therefore, the simplified expression is 68x - 62y.
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PLEASE HELP QUICKLY!! Green peas are dominant to yellow peas. Tall pea plants are dominant to short pea plants. Cross two heterozygous green pea, heterozygous tall pea plants.
PART B: For the dihybrid cross give the FRACTION of the offspring that have each phenotype.
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For a dihybrid cross between two heterozygous individuals, the possible genotypes of the offspring are:
GGTT (green and tall)
GGTt (green and tall)
GgTT (green and tall)
GgTt (green and tall)
GGtt (green and short)
Ggtt (green and short)
ggTT (yellow and tall)
ggTt (yellow and tall)
ggtt (yellow and short)
To determine the fraction of offspring with each phenotype, we need to first determine the genotypic ratio and then use that to calculate the phenotypic ratio. The genotypic ratio is the ratio of the different genotypes that can be produced in the offspring.
From the above list of possible genotypes, we can see that the genotypic ratio for this cross is:
1 GGTT : 2 GgTT : 2 GGtt : 4 Ggtt : 1 ggTT : 2 ggTt : 1 ggtt
To calculate the phenotypic ratio, we need to determine how many of each genotype will result in the dominant green and tall phenotype, the dominant green and short phenotype, the recessive yellow and tall phenotype, and the recessive yellow and short phenotype. Using the principle of dominance, we can see that:
The dominant green phenotype will be expressed in all individuals with at least one dominant G allele.
The dominant tall phenotype will be expressed in all individuals with at least one dominant T allele.
Therefore, the phenotypic ratio can be calculated as follows:
Green and tall: 1 GGTT : 2 GgTT : 2 GGTt : 4 Ggtt = 7/9
Green and short: 1 GGtt : 2 Ggtt = 3/9 or 1/3
Yellow and tall: 1 ggTT : 2 ggTt = 3/9 or 1/3
Yellow and short: 1 ggtt = 1/9
So the fraction of the offspring with each phenotype is:
7/9 will be green and tall
1/3 will be green and short
1/3 will be yellow and tall
1/9 will be yellow and short
Step-by-step explanation: