The trait of "freckles" is dominated and represented by...
Genes determine eye, skin, and hair color in all organisms.The genes in an individual come from the mother and father.Some alleles determine the expression of a trait.Other alleles are less likely to be expressed.A characteristic is determined by the dominant allele and the recessive one.When these characteristics are visible, they are known as phenotypes.The genotypic code is the genetic code behind a trait.
The alleles for brown eyes and blue eyes are both dominant.She will have brown eyes if she gets dominant alleles from both parents.She will have brown eyes if she gets a dominant allele from one parent and a Bb from the other.She will have blue eyes if she gets all her genes from her parents.
In the case of Bb, brown dominates and determines the eye color.The genotype is the genetic material which determines the phenotype.When an individual has either two dominant or two recessive alleles, they are considered Homozygous.Heterozygous is when an individual has one dominant and one recessive all genes.Some people have green eyes, for example, while others have one blue eye and one brown eye.
The Punnett square is a table that shows the probability of inheriting a trait such as eye color.The brown and blue eyes alleles are upper case B and lower case b.
If both parents contribute, the child will have brown eyes.The child will have brown eyes if she carries the B and b all genes from one parent to another.This is because the dominant allele will have an effect on the other.Even though both parents may have brown eyes, the child will have blue eyes if both of them contribute the allele.
The table above shows that both parents have brown eyes, but they also have some of the same genes.There is a 75% chance the child will have brown eyes and a 25% chance he or she will be blue.The scenarios were modeled in the Punnett square.
The last scenario shows how it is possible for the offspring to inherit all of the same genes from both parents, even though neither of them does.
The table below shows that it is impossible for a child to have blue eyes if one of the parents isBB.
All children produced by this couple will have brown eyes, but if one parent isBB and the other isB, there is a 50% chance of having aBB child.
When both parents have the same homozygous trait, the other parent's WW is said to be partially dominant.Both parents' dominant trait can't overtake the other parent's, and characteristics from both parents merge in the offspring.A new, blended trait can be passed on to future offsprings.The snapdragon plant has an example of incomplete dominance.A pink flower is created when a white flower snapdragon is crossed with a red flower.In the case of incomplete dominance, alleles are not present in either parent.
Both parents' characteristics are seen with codominant genes.If a plant gets its genes from two different plants, one with white flowers and the other with red, it will have different colors of flowers.When codominance occurs, alleles are not present in either parent.
The types of dominance described above can be mixed with some characteristics.Human blood types are examples.Both A and B blood types are dominant.A child will be typeAB if he gets the A and B blood types from his parents.A mixture of type A and type B is what this blood type has.Both A and B are dominant over type O.If this child were to receive A from one parent and O from the other, he will be type A, and if he received B from both parents, then he's type B.
Human diseases are hereditary.A heritable disease may be passed down to a child if one or both parents have it.A genetic abnormality may be passed on to another person.
It is possible for a carrier of a disease to not have symptoms of the disease.This occurs when the disease is carried by a child.It is not possible for the trait to manifest in a person with a more dominant, healthy allele.
If one parent has a disease and the other does not, their offspring will not be affected.If both parents are carriers, they have a 25% chance of having a child who is completely unaffected by the disease they both carry, a 50% chance that the child is also a carrier of thedisease, and another 25% of that child suffers from it.75% of a child's immune system is unaffected by the disease, according to another way of looking at it.