What is the genotypic ratio based on the offspring's genotypes?

What is the genotypic ratio based on the offspring's genotypes?

• A. GG:1, Gg:2, gg:1
• B. GG:2, Gg:2, gg:2
• C. GG:1, Gg:1, gg:2
• D. GG:3, Gg:1, gg:1

Answer: (A)

The correct genotypic ratio of GG:1, Gg:2, gg:1 indicates a specific pattern of inheritance typically observed in a monohybrid cross involving two heterozygous individuals. This ratio arises from a Punnett square representing the possible combinations of alleles from the parental genotypes. In this case, if we assume both parents are heterozygous for a trait (Gg), the crosses can generate the following combinations of genotypes in the offspring: 1. One parent contributes a G allele (homozygous dominant) and the other contributes a G allele, resulting in GG. 2. One parent contributes a G allele, and the other contributes a g allele, resulting in Gg (this occurs twice due to the different combinations of parental alleles). 3. Finally, if both parents contribute the g allele, gg results. When these combinations are counted, the resulting ratio of 1 GG, 2 Gg, and 1 gg is derived, leading to the genotypic ratio of 1:2:1. This genotypic ratio is significant because it not only illustrates the expected outcomes of genetic crosses but also helps further understand Mendelian genetics, allowing predictions about the inheritance of traits in

The correct genotypic ratio of GG:1, Gg:2, gg:1 indicates a specific pattern of inheritance typically observed in a monohybrid cross involving two heterozygous individuals. This ratio arises from a Punnett square representing the possible combinations of alleles from the parental genotypes.

In this case, if we assume both parents are heterozygous for a trait (Gg), the crosses can generate the following combinations of genotypes in the offspring:

1. One parent contributes a G allele (homozygous dominant) and the other contributes a G allele, resulting in GG.

2. One parent contributes a G allele, and the other contributes a g allele, resulting in Gg (this occurs twice due to the different combinations of parental alleles).

3. Finally, if both parents contribute the g allele, gg results.

When these combinations are counted, the resulting ratio of 1 GG, 2 Gg, and 1 gg is derived, leading to the genotypic ratio of 1:2:1.

This genotypic ratio is significant because it not only illustrates the expected outcomes of genetic crosses but also helps further understand Mendelian genetics, allowing predictions about the inheritance of traits in