For example, blue eyes indicate a homozygous parent because the gene that expresses blue eye color is a recessive gene.

Brown eyes can be homozygous or heterozygous because the gene that expresses brown eye color is a dominant gene. Keep in mind that eye color is polygenic.

Polygenic traits are traits that rely on more than 1 gene for expression. With that in mind, it is still a good starting point for an educated prediction. This means that in the vast majority of cases, that child will have blue eyes. However, in rare cases, other genes change the color of the eye from blue to brown, hazel, or green. Part 3 of List all known genes for eye color.

Once you have analyzed all of the family members that you plan to include, make a list of their eye colors. This list will need to be analyzed either by hand or using computer software to determine possible eye colors for the baby.

If you have no experience with inherited genes, you should use a computer program or consult someone that has knowledge of how genes are passed down. Use an online calculator. Online calculators do most of the biology and math for you. Enter the eye color of each relative e. When you are finished, the program will analyze the data and tell you the likelihood of each eye color. Draw a Punnett square. A Punnett square can be made for eye color by drawing a chart with 2 columns and 2 rows.

If you can determine the 2 genes that each parent has this is easiest if both parents are homozygous , you can make a Punnett square. This square will tell you the possible gene combinations for your baby, which will indicate the possible eye colors. The Punnett square will also show the probability of each color.

Fill in the Punnett Square. These 4 gene combinations are the possible combinations of your baby. Determine the probability of different eye colors. The 4 boxes represent possible combinations of alleles. If a certain combination does not appear in any box, there is no chance of having that combination. If a combination appears more than once, the chance of the baby carrying those alleles is greater. In the example above, it is clear that the father is homozygous because blue eyes are recessive and that the mother is heterozygous because her father had blue eyes and could only have passed that gene.

This allows you to make a Punnett square with 4 boxes. Did you know you can get expert answers for this article? Unlock expert answers by supporting wikiHow. Meredith Juncker, PhD. Support wikiHow by unlocking this expert answer. Not Helpful 1 Helpful 5. If we simplify the genetics, brown eyes are dominant, and blue eyes are recessive. If both parents are heterozygous meaning they have the brown eye allele and the blue eye allele , they will both have brown eyes, but also have the blue eye allele ready to give to their children.

Not Helpful 1 Helpful 3. Include your email address to get a message when this question is answered. Related wikiHows How to. How to. About This Article. Co-authored by:. Co-authors: 6. Updated: November 5, Categories: Genetics. In image 2 of this series of 2, the baby is showing that he is sad. In this video, a baby smiles when getting kisses from his mother.

Responding to affection is a 4-month cognitive learning, thinking, problem-solving milestone. This image shows a baby reaching for a toy with one hand, a 4-month cognitive learning, thinking, problem-solving milestone. This baby in this photo has used her hands and eyes together — looking at the toy and then reaching for it.

This is a 4-month cognitive learning, thinking, problem-solving milestone. In these 2 images, this baby shows the 4-month cognitive learning, thinking, problem-solving milestone of following moving objects with his eyes from side-to-side. In this video, a baby recognizes her mother from several feet away. In this image, the baby is pushing down on her legs while her feet are on a hard surface.

The baby girl in this picture is lying on her stomach, pushed up on her forearms to her elbows. Skip directly to site content Skip directly to page options Skip directly to A-Z link. Learn the Signs. Act Early. Section Navigation. Facebook Twitter LinkedIn Syndicate. Minus Related Pages. Smiles spontaneously, especially at people. Babbles with expression and copies sounds he hears Description This video shows a 4 month-old babbling with expression and copying sounds he hears.

Cries in different ways to show hunger, pain or being tired Description This photo shows a 4-month-old baby crying in different ways to show hunger, pain or being tired. Cries in different ways to show hunger, pain or being tired. Lets you know if he is happy or sad Description In image 1 of this series of 2, the baby is showing that he is happy.

Responds to affection Description In this video, a baby smiles when getting kisses from his mother. Reaches for toy with one hand Description This image shows a baby reaching for a toy with one hand, a 4-month cognitive learning, thinking, problem-solving milestone.

Hazel eyes 4 months free download

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