Question: Why would a pea plant that is heterozygous for plant height have the dominant phenotype? It has one dominant and one recessive allele, so the phenotype is mixed. It has one dominant allele, which, by definition, would be expressed in the phenotype.
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.
Why does heterozygous genotype have dominant phenotype?
Unlike homozygous, being heterozygous means you have two different alleles. You inherited a different version from each parent. In a heterozygous genotype, the dominant allele overrules the recessive one. Therefore, the dominant trait will be expressed.
What is the phenotype of a heterozygous pea plant?
Heterozygous means that an organism has two different alleles of a gene. For example, pea plants can have red flowers and either be homozygous dominant (red-red), or heterozygous (red-white). If they have white flowers, then they are homozygous recessive (white-white).
What is the phenotype of a pea plant with a heterozygous genotype for height?
Tall. What is the phenotype of a pea plant that is heterozygous ( Tt )? It is also tall. The answer is yes, two different genotypes can result in the same phenotype.
What alleles represent a pea plant that is heterozygous for tallness?
In pea plants height is characterized by having two alleles T(tall) and t(dwarf). Since heterozygous tall pea plant (Tt is the genotype in heterozygous) is crossed with a dwarf pea plant (tt is the genotype in dwarf).
When a pea plant contains two different genes alleles for height it is said to be a?
Heterozygous means to have 2 different alleles for a trait.
Which of the following is heterozygous dominant genotype?
So, the correct answer is D “Tt”.
Which of the following is an example of a heterozygous dominant trait?
Heterozygous means that an organism has two different alleles of a gene. For example, pea plants can have red flowers and either be homozygous dominant (red-red), or heterozygous (red-white).
How is the phenotype of a pea plant different from its genotype?
Phenotype is a way to describe the traits you can see. The genotype is like a recipe for a cake, while the phenotype is like the cake made from the recipe. The genotype expresses the phenotype. For example, the phenotypes of Mendel’s pea plants were either tall or short, or they were purple-flowered or white-flowered.
Is heterozygous dominant or recessive?
An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.
Which is a dominant trait that Mendel observed in pea plants?
These plants would serve as the P1 generation for the experiment. In this case, Mendel crossed the plants with wrinkled and yellow seeds (rrYY) with plants with round, green seeds (RRyy). From his earlier monohybrid crosses, Mendel knew which traits were dominant: round and yellow.
What happens to the phenotype of the heterozygotes when traits are inherited?
Mendel observed that a heterozygote offspring can show the same phenotype as the parent homozygote, so he concluded that there were some traits that dominated over other inherited traits. However, the relationship of genotype to phenotype is rarely as simple as the dominant and recessive patterns described by Mendel.
How can you determine whether an organism is heterozygous or homozygous for a dominant trait?
To identify whether an organism exhibiting a dominant trait is homozygous or heterozygous for a specific allele, a scientist can perform a test cross. The organism in question is crossed with an organism that is homozygous for the recessive trait, and the offspring of the test cross are examined.
What is the genotype for a pea plant heterozygous for round seeds?
Answer: Genotype of a plant pea heterozygous for round seeds and homozygous recessive for green seeds is (d) Rryy. Starting genotype of parents in a dihybrid cross would be (d) RrYy and RrYy.
What is the phenotypic ratio when both heterozygous round pea plant where cross?
9:3:3:1
The P cross produces F1 offspring that are all heterozygous for both characteristics. The resulting 9:3:3:1 F2 phenotypic ratio is obtained using a Punnett square. In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y).
Which phenotype is dominant?
A dominant phenotype refers to a trait which is expressed in one of two conditions: the inheritance of two dominant alleles (homozygous dominant) or the inheritance of one dominant and one recessive allele (heterozygous dominant).
How do you determine if a tall plant is heterozygous or homozygous?
Homozygous plants have two identical copies of a single gene. Heterozygous plants have two copies of a single gene, but those copies are alleles, or different versions of that gene. The second type is heterozygous. Plants that are heterozygous for a particular gene have one copy each of two different alleles, ‘Aa’.
Which trait for plant height is dominant?
tallness
Mendel found that if true-breeding Tall [T] plants are crossed (bred) with true-breeding short [t] plants, all the next generation of plants, called as F1, are all tall. It shows that tallness is the dominant trait.
How do you write a heterozygous dominant?
If “T” is for the dominant allele of a trait (eg. phenotype of brown fur) and “t” is the recessive allele of a trait (eg. phenotype of white fur), then a heterozygous dominant genotype for this trait would be ” Tt “.
When the heterozygous genotype results in a phenotype where both alleles are fully and separately expressed?
Codominance occurs when two heterozygous alleles are fully expressed in the phenotype of an organism. The distinct phenotypes produced by each allele are expressed.