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Based on the pedigree above how many offspring from this cross had the recessive phenotype?
To determine the number of offspring with the recessive phenotype from the pedigree, you would need to analyze the specific symbols and relationships depicted in the pedigree chart. Typically, the recessive phenotype is represented by a specific shape or shading. By counting the individuals displaying that phenotype among the offspring shown in the pedigree, you can arrive at the total number of offspring with the recessive trait. If the pedigree is not provided, I cannot give an exact number.
What else can I help you with?
In a testcross an individual who is is crossed with an individual who is .?
In a testcross, an individual with a dominant phenotype but unknown genotype is crossed with an individual that is homozygous recessive for the same trait. This helps determine the unknown genotype of the dominant individual based on the phenotypic ratios of the offspring. If any offspring display the recessive phenotype, it indicates that the dominant parent is heterozygous. Conversely, if all offspring show the dominant phenotype, the dominant parent is likely homozygous.
What is the genotype of the offspring that do not share the parents phenotype?
If both parents have the same phenotype, but the offspring did not share that phenotype, then it is likely that the parents have a dominant phenotype, but the offspring has a recessive phenotype, which means that the offpring's genotype would be homozygous recessive, and it's parents' genotypes would be heterozygous. For example, the parents may both have the genotype Bb, which gives them black fur. Approximately 25% of their offspring should have the genotype bb, which gives them the phenotype of white fur.
Which genotype is used in a test cross?
In a test cross, one individual with a dominant phenotype but unknown genotype is crossed with a homozygous recessive individual. The genotype of the individual with the dominant phenotype can then be inferred based on the phenotypic ratios of the offspring.
The following seed phenotype a showed up in a generation of plants. Which alleles are recessive?
To determine which alleles are recessive in the seed phenotype, you would need to compare the phenotype of the plants with known dominant phenotypes. Typically, if a phenotype appears in a generation that resembles the parents but differs from the dominant traits, those traits associated with the appearance of phenotype "a" are likely recessive. Observing the inheritance patterns in subsequent generations can further clarify which alleles are recessive based on the phenotypes that re-emerge when homozygous recessive individuals are bred.
RrTt what is the phenotype of this plant?
The genotype RrTt represents a plant that is heterozygous for two traits, with "R" and "r" indicating different alleles for one trait, and "T" and "t" for another. The phenotype will depend on the dominance relationships of these alleles. If "R" and "T" are dominant, the phenotype could express the dominant traits associated with both; if they are recessive, the phenotype will reflect the recessive traits. Therefore, the specific phenotype can vary based on the dominance of the alleles.
In a testcross an individual who is is crossed with an individual who is .?
In a testcross, an individual with a dominant phenotype but unknown genotype is crossed with an individual that is homozygous recessive for the same trait. This helps determine the unknown genotype of the dominant individual based on the phenotypic ratios of the offspring. If any offspring display the recessive phenotype, it indicates that the dominant parent is heterozygous. Conversely, if all offspring show the dominant phenotype, the dominant parent is likely homozygous.
What is the genotype of the offspring that do not share the parents phenotype?
If both parents have the same phenotype, but the offspring did not share that phenotype, then it is likely that the parents have a dominant phenotype, but the offspring has a recessive phenotype, which means that the offpring's genotype would be homozygous recessive, and it's parents' genotypes would be heterozygous. For example, the parents may both have the genotype Bb, which gives them black fur. Approximately 25% of their offspring should have the genotype bb, which gives them the phenotype of white fur.
Which genotype is used in a test cross?
In a test cross, one individual with a dominant phenotype but unknown genotype is crossed with a homozygous recessive individual. The genotype of the individual with the dominant phenotype can then be inferred based on the phenotypic ratios of the offspring.
The following seed phenotype a showed up in a generation of plants. Which alleles are recessive?
To determine which alleles are recessive in the seed phenotype, you would need to compare the phenotype of the plants with known dominant phenotypes. Typically, if a phenotype appears in a generation that resembles the parents but differs from the dominant traits, those traits associated with the appearance of phenotype "a" are likely recessive. Observing the inheritance patterns in subsequent generations can further clarify which alleles are recessive based on the phenotypes that re-emerge when homozygous recessive individuals are bred.
Why is it difficult to determine the genotype of an organism that has a dominant phenotype?
NO, because a dominant phenotype could either be homozygous or a heterozygous.so unless you are sure about the genotype of parents we can't determine it...but we can determine the genotype of a person showing reccessive phenotype, as a recessive trait always expresses itself in a homozygous condition...
What is the phenotypic ratio of the following dihybrid cross AaBb x AaBb?
The phenotypic ratio of the cross AaBb x AaBb is 9:3:3:1, which represents the different possible combinations of genotypes for the offspring based on the principles of Mendelian genetics. This ratio indicates that 9 out of 16 offspring will exhibit the dominant phenotype for both traits, while 3 out of 16 will exhibit one dominant and one recessive phenotype, 3 out of 16 will exhibit the other dominant and recessive phenotype, and 1 out of 16 will exhibit both recessive phenotypes.
What is the probability than an offspring will have round seeds?
The probability of an offspring having round seeds depends on the genetic makeup of the parents. If round seeds are dominant (represented by "R") and wrinkled seeds are recessive (represented by "r"), the offspring's genotype will determine the phenotype. For example, if both parents are heterozygous (Rr), the probability of an offspring having round seeds would be 75%, as only the homozygous recessive (rr) genotype would produce wrinkled seeds. The specific ratio can vary based on the genotypes of the parents involved.
RrTt what is the phenotype of this plant?
The genotype RrTt represents a plant that is heterozygous for two traits, with "R" and "r" indicating different alleles for one trait, and "T" and "t" for another. The phenotype will depend on the dominance relationships of these alleles. If "R" and "T" are dominant, the phenotype could express the dominant traits associated with both; if they are recessive, the phenotype will reflect the recessive traits. Therefore, the specific phenotype can vary based on the dominance of the alleles.
What it the easiest way to determine if an organism is heterozygous or homozygous for a particular gene if self fertalization is not possible?
The easiest way to determine if an organism is heterozygous or homozygous for a particular gene, when self-fertilization is not possible, is through a test cross. This involves crossing the organism with a known homozygous recessive individual for the gene in question. If any offspring display the dominant phenotype, the organism is heterozygous; if all offspring show the dominant phenotype, then the organism is homozygous dominant. This method allows for clear observation of the genetic makeup based on the phenotypic ratios of the offspring.
This pedigree is for a human genetic disease called sickle cell anemia. Assuming that the allele for the disease is recessive how many of the females shown have the disease?
None. =]
How do dominant and recessive alleles affect pheno type?
An allele can effect the phenotype of an organism by its dominance or recessiveness. If two dominant alleles are crossed the offsprings will carry the dominant trait of the alleles. If a dominant allele is crossed with recessive allele the phenotype of the offsprings will be of that of the dominant allele. And if two recessive alleles are crossed the phenotype of their offsprings will carry the reccesive trait.
When offspring show a blend of the parents traits one allele is dominant over the other?
The results in the offspring hinge on the genetic make up of the parents. Each expressed trait is either the result of a dominant or recessive phenotype. The relative dominance or recessiveness of the alleles doesn't change only the rate at which they are expressed based on the allele present for each obseerved trait in the parents.
