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As I'm sure you know, we get half of our genetic material from each parent, and we have two genes for every characteristic, one from mother and one from father, with the exception of a few traits found on the end of the X chromosome in males, who have an XY configuration and must depend on whichever gene the mother gave for certain characteristics such as color vision and proper blood clotting.
During meiosis, egg or sperm cells are formed when our chromosomes are split in half to allow for the fertilization process to complete the genetic codes from the other parent.
A Punnett square can be used to predict only which possible gene might be given by a single egg or sperm cell based on genotype of the parent, if known, but it is incomplete without the other portion of the code. However, it can be used to show how one parent may contribute either a dominant or recessive gene for a particular trait if the parent's complete genotype is known.
For example, I know that my blood type is A, which is my phenotype, but that my genotype is AO because my father was type O and that is the only gene a type O person can donate. Type O genes are recessive, so that phenotype would not show up if someone inherits either a type A or type B gene from the other parent, but the type O gene would have a 50-50% chance of ending up in my egg cells after meiosis split my blood type gene combination (AO), called the genotype, in half. Half of my eggs would therefore contain type A genes and the other half would have type O genes, and that could be put on a Punnett square to show the 50-50% chance of my offspring having either type A or type O blood, depending on which gene he inherits from me, but the father's genotype is needed to complete the full Punnett square possiblities.
Since my husband is type O, he could donate only an O gene in every sperm cell, which means that his meiotic Punnett square would have only type O genes in every square.
For a true genetic prediction, both genotypes of each parent must be combined, but at least in meiosis, it can be predicted that I have a 50-50% chance to donate either a type A gene or a type O gene to my offspring, while my husband has a 100% chance to donate a type O gene because his genotype has to be OO. Our son, therefore must be either type A or type O and has a 50% chance of having either. We don't know because his blood type has never been tested, but those are his only possibilities.
Since neither my husband nor I have type B genes, it would be impossible for our child to have type B or AB blood, which could be deduced from a Punnett square for meiosis for his mother and his father since our genotypes for this trait are known positively.
I hope this helped!
What else can I help you with?
A punnett square is a shorthand way to show the events that occur during what?
A punnett square is a shorthand way to show the possible genetic outcomes or combinations that can result from a genetic cross between two individuals. It helps predict the probability of specific traits being passed on to offspring.
What goes on the outside of a Punnett Square?
On the outside of the Punnett Square you put the genotype or two alleles of the parents.
How do punnett squares relate to meiosis?
The square shows the possible alleles and how they can be expressed when they come together once again.It is used In genetics and is a type of grid used to show the gametes (sex cells) of each parent and their possible offspring. Sometimes it is explained as a type of grid that can indicate all the possible outcomes of a genetic cross.It is named after Reginald Crundall Punnett, an English geneticist.
Where did the name of the Punnett square come from?
The Punnett square is named after the British geneticist Reginald Punnett, who developed the concept in the early 20th century. He used the grid to visually represent the possible outcomes of genetic crosses between different organisms.
A tool used to visualize all the possible combination of alleles from parents?
A Punnett square is used to visually predict the potential genetic outcomes of offspring based on the alleles inherited from the parents. This tool helps understand the probability of different genetic inheritance patterns occurring in the offspring.
How is the Punnett square a model for what happens during meiosis?
It shows the possible allele combinations after fertilisation. You can use the punnett square to show what will happen if one or both of the parents have genetic disorders/mutations, what features will be passed on to their kids, etc.
How is a Punnett square a model a model for what happens during meiosis?
Haha, lazy for workbook questions, eh? Well here ya' go. Punnett squares are a model for what happens during meiosis because they are an easier way to show the events that occur at meiosis. ^ so not the answer. LOL During meiosis, the chromosomes segregate into gametes. The gamete of one parent combines with the gamete of another. A PS has all the possible gametes of both parents. One on the top and one going down the left. The squares are then filled with all the possible combinations. So it shows all the possible products of meiosis for both parents, and then all of their possible combinations...
A punnett square is a shorthand way to show the events that occur during what?
A punnett square is a shorthand way to show the possible genetic outcomes or combinations that can result from a genetic cross between two individuals. It helps predict the probability of specific traits being passed on to offspring.
What is the name of the square used to illustrate the genetic crossing of parents phenotype?
Punnett square
A chart used to predict results of genetic crosses is known as a?
Punnett square
A helpful device for predicting the ratios of possible genotypes is a?
the Punnett square
What happens when 2 different allele s for the same trait are present?
if the two alleles are the same in the same box in the punnett square then that trait is expressed. when there is a double in a punnett square then that gene is always expressed
Diagram that indicates all possible genotypes of a genetic cross?
punnett square
What goes on the outside of a Punnett Square?
On the outside of the Punnett Square you put the genotype or two alleles of the parents.
The diagram below illustrates which type of chromosomes that may cross over and exchange portions of their chromatids during meiosis?
what type of cell has two sets of chromosomes
What does the capital letter in a Punnett square represent?
In a Punnett square, a capital letter represents a dominant allele.
How do punnett squares relate to meiosis?
The square shows the possible alleles and how they can be expressed when they come together once again.It is used In genetics and is a type of grid used to show the gametes (sex cells) of each parent and their possible offspring. Sometimes it is explained as a type of grid that can indicate all the possible outcomes of a genetic cross.It is named after Reginald Crundall Punnett, an English geneticist.
