Transcribed Image Text: 4. In dogs, the tendency to bark while traliling is due to a dominant gene while silent trailing is recessive. Erect ears is dominant over drooping ears. Show the offspring expected from a cross between two erect-eared barkers who

Transcribed Image Text: 4. In dogs, the tendency to bark while traliling is due to a dominant gene while
silent trailing is recessive. Erect ears is dominant over drooping ears. Show the
offspring expected from a cross between two erect-eared barkers who are
heterozygous for both genes
a. Possible genotypes for Barking while trailing:
b. Possible genotypes for Erect ears:
Silent:
Drooping ears
c. Male genotype:
d. Female
Male possible gametes
genotype:Female possible gametes:
e.
f. Genotypic Ratio:
g. Phenotypic Ratio:

4. In dogs, the tendency to bark while trailing is due to a dominant gene, while silent trailing is recessive. Erect ears are dominant over drooping ears. In this assignment, we are asked to determine the potential offspring from a cross between two dogs who are heterozygous for both genes and are also erect-eared barkers.

a. Possible genotypes for barking while trailing:
In this case, the dominant gene for barking while trailing is represented by the letter B, while the recessive gene for silent trailing is represented by the letter b. Since both parents are heterozygous for this trait, we can represent their genotypes as Bb. When these two dogs are crossed, the possible genotypes for barking while trailing in their offspring will be BB, Bb, Bb, and bb.

b. Possible genotypes for erect ears:
Here, erect ears are represented by the dominant gene E, while drooping ears are represented by the recessive gene e. Both parents are erect-eared, so their genotypes would be represented as EE. Therefore, the possible genotypes for erect ears in their offspring will be EE, EE, EE, and EE.

c. Male genotype:
Since the male dog is heterozygous for both barking while trailing (Bb) and erect ears (EE), we can represent his genotype as BbEE.

d. Female genotype:
Similarly, the female dog is also heterozygous for both barking while trailing (Bb) and erect ears (EE). Thus, her genotype is also BbEE.

e. Male possible gametes genotype:
To determine the possible gametes that the male dog can produce, we need to separate his genotype into individual alleles. This can be achieved by separating his genotype into two sets of alleles, one set for barking while trailing (B and b) and the other set for erect ears (E and E). Therefore, the possible gametes that the male dog can produce are BE and BE.

f. Female possible gametes genotype:
Similarly, the female dog’s genotype can be separated into two sets of alleles: B and b for barking while trailing, and E and E for erect ears. Thus, the possible gametes that the female dog can produce are also BE and BE.

g. Genotypic ratio:
To determine the genotypic ratio of the potential offspring, we need to consider all possible combinations of alleles from both parents. From our earlier analysis, we know that the male dog can produce gametes of BE and BE, while the female dog can also produce gametes of BE and BE. By combining these gametes, we can create a Punnett square to determine the genotypic ratio:

BE | BBE | BBE |
BE | BBE | BBE |

In this Punnett square, we can see that all the potential offspring will have the genotype of BBE. Therefore, the genotypic ratio of the potential offspring will be 100% BBE.

g. Phenotypic ratio:
Since BBE represents the genotype for both traits (barking while trailing and erect ears), all the potential offspring will have the same phenotype. Therefore, the phenotypic ratio will also be 100% Barking while trailing with erect ears.

In summary, when two heterozygous erect-eared barking dogs are crossed, the potential offspring will have the genotype BBE and the phenotype of barking while trailing with erect ears.