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In horses, gray horses (GG) are codominant to white horses (WW). The heterozygous horse (GW) is an Appaloosa horse (a white horse with gray spots on the rump and loins). Cross a white horse with an Appaloosa horse. Construct a Punnett square and give the genotypic and phenotypic ratios of the offspring.

Parents:

White Horse: WW
Appaloosa Horse: GW

Punnett Square:

[tex]\[
\begin{array}{c|c|c}
& G & W \\
\hline
W & GW & WW \\
W & GW & WW \\
\end{array}
\][/tex]

Genotypic Ratios:

- GW: 2/4 (50%)
- WW: 2/4 (50%)

Phenotypic Ratios:

- Appaloosa: 50%
- White: 50%

Sagot :

GinnyAnswer
To determine the genotypic and phenotypic ratios of the offspring when a white horse (WW) is crossed with an appaloosa horse (GW), we need to construct a Punnett square.

Step-by-Step Solution:

1. Identify the Genotypes of the Parents:

- White horse: WW
- Appaloosa horse: GW

2. Set Up the Punnett Square:

- One parent's genotype (WW) will go across the top of the Punnett square.
- The other parent's genotype (GW) will go down the left side of the Punnett square.

Here's how you set it up:

```
G W
-------
W| WG | WW |
-------
W| WG | WW |
-------
```

3. Fill in the Punnett Square:

- Combine the alleles from the top and side to fill in the squares.

- Top row (first W from WW):
- First column (G from GW): WG
- Second column (W from GW): WW

- Bottom row (second W from WW):
- First column (G from GW): WG
- Second column (W from GW): WW

The completed Punnett square looks like this:

```
G W
-------
W| WG | WW |
-------
W| WG | WW |
-------
```

4. Determine Genotypic Ratios:

- The genotypes of the offspring in this Punnett square are:
- WG (Appaloosa) appears 2 times
- WW (White) appears 2 times

- Genotypic ratio:
- WW: 2
- WG: 2

5. Determine Phenotypic Ratios:

- Phenotypically, considering the provided information, we have:
- White (WW) horses
- Appaloosa (WG) horses

- Phenotypic ratio:
- White: 2
- Appaloosa: 2

6. Summarize the Results:

Genotypic Ratio:
- WW: 2
- WG: 2

Phenotypic Ratio:
- White Horses: 2
- Appaloosa Horses: 2

Therefore, if you cross a white horse (WW) with an appaloosa horse (GW), you will get:
- 50% White horses (WW)
- 50% Appaloosa horses (WG)

This analysis aligns with our understanding of the inheritance of color traits in these horses, resulting in equal numbers of white and appaloosa offspring.
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