What is the genotype of a brown eyed individual who marries a blue eyed individual and produces a first offspring that is blue eyed?
1. If B is the allele for brown eyes and b is blue, the genotype of the blue-eyed man is bb. His wife must be a Bb heterozygote–she must have a B allele (she has brown eyes), but she must also have inherited a b allele from her blue-eyed mother (whose genotype was bb)….
| R | W | |
|---|---|---|
| B | RB (red) | BW (blue) |
| W | RW (red) | WW (white) |
What happens when one parent has brown eyes and the other blue?
If one of the grandparents has blue eyes, the odds of having a baby with blue eyes increases slightly. If one parent has brown eyes and the other has blue eyes, the chances of having a brown-eyed or blue-eyed baby are roughly even.
What would be expected in the offspring of a blue eyed man and a brown eyed woman whose mother had blue eyes?
Answer and Explanation: If a blue-eyed man marries a brown-eyed woman whose mother had blue eyes, we would expect 0.50 or 50% of the children in this family to have blue…
What is the genotype for brown eyes?
Of these three genotypes, only bb, the homozygous recessive genotype, will produce a phenotype of blue eyes. The heterozygous genotype and the homozygous dominant genotype both will produce brown eyes, though only the heterozygous genotype can pass on the gene for blue eyes.
Can a couple who both have brown eyes have a child with blue eyes Punnett Square?
So a brown-eyed person may carry both a brown version and a non-brown version of the gene, and either copy may be passed to his children. Two brown-eyed parents (if both are heterozygous) can have a blue-eyed baby.
What is the genotype of a blue eyed person?
An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. In the eye color example, this genotype is written bb. Of these three genotypes, only bb, the homozygous recessive genotype, will produce a phenotype of blue eyes.
How do 2 brown eyes make blue?
If both of you have brown eyes, then there is generally a 25% chance that the baby will have blue eyes if both of you carry the recessive blue-eye gene. But if only one of you has a recessive blue-eye gene, and the other has two brown, dominant genes, then there is a less than 1% chance of the baby having blue eyes.
Which type of genotype would result in having blue eyes if B is dominant for brown eyes?
Is it possible for a child to have blue eyes when both parents have brown?
If both parents have blue eyes, the children will have blue eyes. If both parents have brown eyes, a quarter of the children will have blue eyes, and three quarters will have brown eyes. The brown eye form of the eye color gene (or allele) is dominant, whereas the blue eye allele is recessive.
How do you make a Punnett square for eye color?
Let’s make the Punnett Square for eye color. If the father is heterozygous for brown eyes, this means he has one brown eye allele and one blue eye allele. Write Bb at the top of the square. The capital B is for brown eyes and the lower case b is for blue eyes.
What does the Punnett square tell us?
The Punnett Square shows you how different gene combinations lead to different characteristics like eye color. In the given scenario (one parent is heterozygous for brown and blue eye alleles and one is homozygous for blue eyes), their child has a 50% chance of having blue eyes.
How do you find the mother and father of a brown eye?
If the father is heterozygous for brown eyes, this means he has one brown eye allele and one blue eye allele. Write Bb at the top of the square. The capital B is for brown eyes and the lower case b is for blue eyes. Write bb (a homozygous blue eye allele) on the side of the square – these are the mother’s genes.
How does the Punnett square illustrate Mendelian inheritance?
When looking at the model of inheritance which the Punnett Square illustrates (referred to as Mendelian inheritance ), you are observing combinations of dominant alleles and recessive alleles. An allele is a version of a gene (the eye color gene can consist of blue, brown, green, gray, and hazel alleles). Dominant genes mask recessive genes.