How is it possible for an organism to have a recessive phenotype for a trait such as white flowers in pea plants? The organism inherits the recessive allele from both parents.
How is it possible for an organism to have a recessive phenotype for a trait?
Recessive alleles only express their phenotype if an organism carries two identical copies of the recessive allele, meaning it is homozygous for the recessive allele. This means that the genotype of an organism with a dominant phenotype may be either homozygous or heterozygous for the dominant allele.
Is it possible for you to have a specific phenotype of a trait that neither of your parents have?
In some instances, offspring can demonstrate a phenotype that is outside the range defined by both parents. In particular, the phenomenon known as overdominance occurs when a heterozygote has a more extreme phenotype than that of either of its parents.
What are the possible pairs of alleles for flower Colour in a pea plant that has purple flowers?
In pea plants, purebred purple flowers have a genotype with two purple alleles, which produces a phenotype of purple petals. Purebred white flowers have a genotype of two white alleles, which displays the white phenotype.
How is the phenotype of a pea plant different from its genotype?
An organism’s genotype is its specific combination of alleles for a given gene. So, for example, in the pea plants above, the possible genotypes for the flower-color gene were red-red, red-white, and white-white. The phenotype is the physical manifestation of an organism’s allellic combination (genotype).
Is it possible to determine the genotype for a recessive trait?
For an organism to demonstrate the recessive phenotype there is only one possible genotype that can be attributed to them. For example brown eyes (B) is dominant over blue eyes (b). If an organism has blue eyes, the only possible genotypic combination is (bb), as there cannot be any presence of the dominant gene.
How are recessive traits inherited?
Autosomal recessive inheritance is a way a genetic trait or condition can be passed down from parent to child. A genetic condition can occur when the child inherits one copy of a mutated (changed) gene from each parent. The parents of a child with an autosomal recessive condition usually do not have the condition.
What is the recessive phenotype?
Definition. A phenotype that requires two copies of the causal variant in an individual to occur.
What is the definition for recessive trait?
Refers to a trait that is expressed only when genotype is homozygous; a trait that tends to be masked by other inherited traits, yet persists in a population among heterozygous genotypes.
When the effects of genes add up to make the phenotype they are called dominant recessive genes?
When the effects of genes add up to make the phenotype, they are called dominant-recessive genes. The most common extra-chromosome condition is fragile X syndrome.
How do you know that the pea white flower allele is a recessive allele?
A capital letter indicates a dominant allele. Two copies of a recessive allele are needed to see the corresponding phenotype. For pea flower color, the white-flower allele is recessive. A lowercase letter indicates a recessive allele.
Is there any possible way that two pea plants with dark purple flowers can produce a white flowered offspring?
Answer and Explanation: Assuming that purple flowers are dominant to white flowers, the only way that two purple-flowered plants could produce plants with white flowers is if the purple plants were heterozygous.
Why would a pea plant that is heterozygous for the tallness trait have the dominant phenotype?
A heterozygous tall plant will have a genotype of Tt. T is mainly the dominant allele and will actually rule over the t allele, which is recessive. Therefore, due to the presence of the T allele, the plant will show a tall phenotype. Hence, the tall phenotype will be observed in a heterozygous tall pea plant.
Can two organisms have different phenotypes but the same genotype?
Even two organisms with identical genotypes normally differ in their phenotypes.
Is it possible for two individuals to have the same phenotype but different genotypes the same genotype but different phenotypes How?
The answer is yes, two different genotypes can result in the same phenotype. Remember, the recessive phenotype will be expressed only when the dominant allele is absent, or when an individual is homozygous recessive (tt) (Figure below).
How can one phenotype result from more than one genotype?
Since the phenotype is the result of an interaction between genes and the environment, different environments can lead to different traits in individuals with a particular genotype. In addition, different genotypes can lead to the same phenotype. This happens because genes have different alleles.
How is it possible for an offspring to exhibit a recessive trait if neither parent exhibited that recessive trait what must be true about the parents genes for this to occur?
What must be true about the parents’ genes for this to occur? It’s possible because the offspring could have received a genetic trait by the parents parents and that genetic trait could have just skipped a generation.
What is the genotype of an individual with the recessive phenotype?
The genotype aa would result in an individual with the recessive phenotype. aa is a homozygous genotype that consists of two recessive alleles. There is no dominant allele present in this genotype to overrule the effect of recessive alleles. Aa is a heterozygous genotype.
Can a person’s genotype be determined by their phenotype Why or why not?
No, a person’s genotype cannot be determined solely by their phenotype as many genes in our genome do not get expressed. This is also complicated different relationships between the alleles of a gene, such as complete dominance, incomplete dominance, and codominance along with polygenetic expression.
How do recessive genes become dominant?
What makes a trait recessive has to do with the particular DNA difference that leads to that trait. So one way a trait can go from recessive to dominant is with a new DNA difference that is dominant and causes the same trait.
What is meant by dominant genes and recessive genes give one example of each?
The gene which can decide the appearance of an organism only in the presence of another identical gene is called a recessive gene. For example, in pea plants, the dominant gene for tallness is T and the recessive gene for dwarfism is t. (c) Genes are responsible for the characteristic features of an organism.