Question

Considering what you know about dominant and recessive genes, what are the possible genotypes for brown-eyed babies? What are the possible genotypes for blue-eyed babies? Explain how you came to this response making sure to discuss dominant and recessive genes.(This question also goes with question #4 I really hope you able to answer both ,sorry lol)

Answer 1

Given in the question, blue eyes is recessive trait and brown eyes is the dominant trait

For blue eyes, the genotypes are bb (as the trait is recessive)

For brown eyes, the trait would be BB or Bb

BB is the homozygous dominant and Bb is the heterozygous trait where B is dominant over b

In the question itself, it is shown B= brown eyes and b= blue eyes

When the allele is represented with a capital letter it is dominant and when it is represented with small letter, then it is recessive.

There are two cases possible

1.

`\begin{bmatrix}{\placeholder{⬚}} & {B} & {b} \\ {b} & {Bb} & {bb} \\ {b} & {Bb} & {bb}\end{bmatrix}`

Here the Bb are brown and bb are blue, also the ratio of Bb and bb is 1:1, the parental genotypes would be Bb and bb resulting in babies with brown and blue eyes

2. In second case

`\begin{bmatrix}{\placeholder{⬚}} & {B} & {B} \\ {b} & {Bb} & {Bb} \\ {b} & {Bb} & {Bb}\end{bmatrix}`

Here the genotypes of the progenies will have brown eyes only.

The first case would justify the condition.