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Hey there. Ive typed up a couple to use as examples using the brown hair. You must take into account the recessive and dominant traits, as this could range your answer being different.
A phenotype is the result of a genotype, which is the result of 2 alleles. Say if both parents were HOMOZYGOUS for brown hair, with their genotype would be BB, BB. Use a trick called a punnet square to answer this;
_|B |B |
B|BB|BB| <-- not the best punnet square, but the top row shows the first parents
B|BB|BB| genotype (BB) and the side shows the second's. (BB) The cross of this
shows all the children will have brown hair, as inherited from each parent.
If the Mother had HOMOZYGOUS brown hair (BB), and the father had HETEROZYGOUS brown hair (Bb) the results would be 100% Brown hair too, because the brown hair gene (B) is dominant over the non brown hair gene (b). Below;
_|B |B |
B|BB|BB| <--- this shows the cross gives a 50% chance to be Homozygous for brown
b|Bb|Bb| hair but 50% heterozygous for brown hair, but carrying a non- brown hair
gene.
If we cross 2 heterozygous parents, the results are shown:
_|B |b |
B|BB|Bb|
b|bB|bb| <----- This shows the child has a 75% chance of having brown hair (either
(BB or bB, Bb) and 25% of being non-brown (bb)).
This can be used in any gene cross, but you must keep in mind that one gene will be dominant and one will be recessive. I used the brown hair gene as an example here, as I don't know whether it may be dominant or recessive to other hair colours.
Also, if you were after a global statistic, I wouldn't know. I hope this helps you.
Fletch
For a punnet square counting only one trait:
Count all of the ones that have a capital letter. This is the number with the dominant phenotype. All of the ones with both lowercase letters are the recessive phenotype.
The Genotypic ratio of Dihybrid cross is 1:2:2:4:1:2:1:2:1
this ratio also called as dihybrid ratio.
In a dihybrid cross involving two heterozygous parents (AaBb x AaBb), the genotypic ratio is 1:2:2:4 for the possible combinations of genotypes AA, Aa, BB, Bb in the offspring.
the phenotipic ratio is:
9:3:3:1
and i dnt know the genotipic!!
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The phenotypic ratio resulting from a dihybrid cross showing independent assortment is expected to be what?
The phenotypic ratio resulting from a dihybrid cross showing independent assortment is expected to be 9:3:3:1. This ratio is obtained when two heterozygous individuals are crossed for two traits that are independently inherited. The ratio represents the different combinations of phenotypes that can arise from the cross.
Why does the expected genotypic ratio often differ from the expected phenotypic ratio from monohybrid cross?
Because in heterozygotes, both alleles are transcribed and translated.
Is RR X Dd a dihybrid cross?
Yes, RR x Dd is a dihybrid cross. In this cross, the parental generation differs in two genetic traits represented by the genes R and D. The resulting offspring will inherit combinations of alleles from both parents, leading to various genotypic and phenotypic outcomes for the two traits.
What kind of cross predicts the inheritance of two characteristic s?
dihybrid cross
What is the genotypic ratio for a tetrahybrid cross?
1:1:1:1:1:1:1:1 ratio is the expected outcome of a heterozygous (BbGgCc) and a homozygous recessive (bbggcc) cross.
What is the expected genotypic ratios for di-hybrid cross and mono-hybrid cross?
In a dihybrid cross, the expected genotypic ratio is 1:2:1 for homozygous dominant: heterozygous: homozygous recessive genotypes, respectively. In a monohybrid cross, the expected genotypic ratio is 1:2:1 for homozygous dominant: heterozygous: homozygous recessive genotypes, respectively.
Why does the expected genotypic ratio often differ from the expected genotypic ratio resulting from a monohybrid cross?
becouse you touch yourself at night.
What is the genotypic ratio of the offspring from a cross of AAA x AAA?
The genotypic ratio of a cross of Aa and Aa is: one AA, one aa, and two Aa. Or 1:2:1
What kind of cross produces 9 3 3 1 ratio of offspring?
Dihybrid cross
What is the difference between a monohybrid and dihybird cross?
A monohybrid cross involves the study of one trait or gene, whereas a dihybrid cross involves the study of two traits or genes simultaneously. In a monohybrid cross, only one pair of alleles is considered, while in a dihybrid cross, two pairs of alleles are considered.
What is a mendelian ratio?
A Mendelian ratio is a ratio that describes the expected outcome of a genetic cross between two individuals for a particular trait, based on Mendel's principles of inheritance. For example, a 3:1 Mendelian ratio would indicate that in a monohybrid cross involving a dominant and recessive allele, approximately 75% of the offspring would exhibit the dominant trait and 25% would exhibit the recessive trait.
The phenotypic ratio resulting from a dihybrid cross showing independent assortment is expected to be what?
The phenotypic ratio resulting from a dihybrid cross showing independent assortment is expected to be 9:3:3:1. This ratio is obtained when two heterozygous individuals are crossed for two traits that are independently inherited. The ratio represents the different combinations of phenotypes that can arise from the cross.
Why does the expected genotypic ratio often differ from the expected phenotypic ratio from monohybrid cross?
Because in heterozygotes, both alleles are transcribed and translated.
Is RR X Dd a dihybrid cross?
Yes, RR x Dd is a dihybrid cross. In this cross, the parental generation differs in two genetic traits represented by the genes R and D. The resulting offspring will inherit combinations of alleles from both parents, leading to various genotypic and phenotypic outcomes for the two traits.
Rr x Rr is an example of what type of cross?
Rr x Rr is an example of a monohybrid cross, specifically a cross between two heterozygous individuals for a single trait. This type of cross helps determine the possible genotypic and phenotypic outcomes for the offspring.
What kind of cross predicts the inheritance of two characteristic s?
dihybrid cross
What is the genotypic ratio for a tetrahybrid cross?
1:1:1:1:1:1:1:1 ratio is the expected outcome of a heterozygous (BbGgCc) and a homozygous recessive (bbggcc) cross.
