4.1.1 Number of brown goats in the F₁ generation
0
4.1.2 The phenotypic ratio for the F₂ generation
24 white goats : 8 brown goats
OR
3 white goats : 1 brown goat
4.1.3 Punnet square method to determine the genotypic ratio in the F₂ generation
$$
\begin{array}{|c|c|c|}
\hline
& W & W \\
\hline
W & WW & Ww \\
\hline
w & Ww & ww \\
\hline
\end{array}
$$
The ratio of the genotype is 1:2:1 (1 WW : 2 Ww : 1 ww) - NSC Agricultural Sciences - Question 4 - 2018 - Paper 2
Question 4
4.1.1 Number of brown goats in the F₁ generation
0
4.1.2 The phenotypic ratio for the F₂ generation
24 white goats : 8 brown goats
OR
3 white goats : 1 brown goat
... show full transcript
Worked Solution & Example Answer:4.1.1 Number of brown goats in the F₁ generation
0
4.1.2 The phenotypic ratio for the F₂ generation
24 white goats : 8 brown goats
OR
3 white goats : 1 brown goat
4.1.3 Punnet square method to determine the genotypic ratio in the F₂ generation
$$
\begin{array}{|c|c|c|}
\hline
& W & W \\
\hline
W & WW & Ww \\
\hline
w & Ww & ww \\
\hline
\end{array}
$$
The ratio of the genotype is 1:2:1 (1 WW : 2 Ww : 1 ww) - NSC Agricultural Sciences - Question 4 - 2018 - Paper 2
Step 1
Number of brown goats in the F₁ generation
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Answer
No brown goats are present in the F₁ generation, as indicated by the value '0'.
Step 2
The phenotypic ratio for the F₂ generation
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Answer
In the F₂ generation, the phenotypic ratio can either be represented as 24 white goats to 8 brown goats, which simplifies to a ratio of 3:1, or as 3 white goats to 1 brown goat.
Step 3
Punnet square method to determine the genotypic ratio in the F₂ generation
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Answer
Using a Punnett square, the genotypes can be derived from the gametes. The gametes are W and w, resulting in the following combinations:
WwWWWWwWWwww
Thus, the genotypic ratio derived from the Punnett square is 1:2:1 (1 WW : 2 Ww : 1 ww).
