Question

Direction. Compare genotypic and phenotypic ratios for a typical Mendelian Trait. Let D= dominant allele and d= recessive allele, while DD, Dd, and dd represent the homozygous dominant, heterozygous dominant and homozygous recessive genotypes, respectively. For each type of cross, determine the genotypic and phenotypic ratios, respectively. The first cross was already done for you. Cross Genotypic Ratio Phenotypic ratio 1. DD x DD 100% DD 100% Dominant 2. DD x Dd 3. DD x dd 4. Dd x Dd 5. Dd x dd 6. Dd x dd​

Answer 1

The comparison of the genotypic and phenotypic ratios of the crosses are as follows:

• DD x Dd:

50% DD, 50% Dd (genotype); 100% Dominant

• DD x dd:

100% Dd (genotype); 100% dominant

• Dd x Dd:

50% Dd, 25% DD, 25% dd (genotype); 75% dominant, 25% recessive (phenotype)

• Dd x dd:

50% Dd, 50% dd (genotype); 50% dominant, 50% recessive (phenotype)

How to find genotypic and phenotypic ratios?

In genetics, the genotype is the genetic constituent of an organism while the phenotype is the expressed trait.

According to this question, the genotypic and phenotypic ratios of cross combinations involving two alleles D and d is given.

The genotype of the offsprings of each cross is as follows:

1. DD x Dd: DD, DD, Dd, Dd
2. DD x dd: Dd, Dd, Dd, Dd
3. Dd x Dd: DD, Dd, Dd, dd
4. Dd x dd: Dd, Dd, dd, dd

Therefore, the genotypic and phenotypic ratios of these crosses are as follows:

• DD x Dd:

50% DD, 50% Dd (genotype); 100% Dominant

• DD x dd:

100% Dd (genotype); 100% dominant

• Dd x Dd:

50% Dd, 25% DD, 25% dd (genotype); 75% dominant, 25% recessive (phenotype)

• Dd x dd:

50% Dd, 50% dd (genotype); 50% dominant, 50% recessive (phenotype)

Learn more about genotype and phenotype at: brainly.com/question/9305691

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