Why is the allele for wrinkled seed shape in garden peas considered recessive? The trait associated with the allele is not expressed in heterozygotes. The allele found in haploid organisms cannot be dominant or recessive.
Why is the allele for wrinkled seed shape in garden pea consider recessive?
(The wrinkled allele is a rare mutant). It recedes in the `F_2` generation when homozygous parents are crossed. Individuals with the allele have lower fitness than that of individuals with the dominant allele.
| Question | |
|---|---|
| Subject | Biology (more Questions) |
| Class | 12th |
| Type of Answer | |
| Question Language | In Text – English |
What are the alleles of a pea plant with two recessive traits?
For example, if a pea plant has a red flower-color allele and a white flower-color allele, then it is a carrier of the recessive white flower-color allele. In humans, people who have both a normal and a mutant allele for the CF gene are carriers for the mutant recessive CF allele.
What is the genetic basis of the wrinkled phenotype of pea seed?
Solution: The tiny grain size produced by a double recessive allele is the genetic basis for the wrinkled phenotype of pea seed.
What is recessive allele?
A type of allele that when present on its own will not affect the individual.
Are wrinkled peas dominant or recessive?
Because the allele that produces wrinkled peas is recessive, the offspring of this cross will all have wrinkled peas. Mendel then explains the concept of dominant and recessive alleles by saying, “By performing my experiments with peas, I learned a lot about genetics and how traits are passed on.
Which of the following is a recessive trait in garden pea plant?
green seed colour
Explanation: Mendel based his experiments on pea plants and studied seven pairs of contrasting traits. Yellow seed colour is the dominant trait and green seed colour is the recessive trait.
What are the alleles for the green pea seed?
As you may be aware, traits like seed color are determined by the genes in a plant’s DNA. In the case of Mendel’s peas, there are two different versions, or alleles, for seed color: yellow (Y) and green (y). Every plant will have two copies of each gene. We call this combination of alleles the plant’s genotype.
Which pair of alleles represents a recessive trait?
Recessive alleles are denoted by a lowercase letter (a versus A). Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait.
What is the genotype of a wrinkled pea plant?
The shape of the seeds are controlled by two alleles Round (R) and Wrinkled (r). Round shape is the dominant one and wrinkled shape is the recessive trait. Now for wrinkled phenotype to be shown, the genotype has to be recessive homozygous. Therefore, the genotype of wrinkled phenotype is rr.
Why does an individual always have only two alleles for a given gene?
A person has two alleles for a gene as it inherits, from each of its parents, a set of chromosomes. Hence, it has two sets of chromosomes, one from each of its parents. Consequently, there are two copies of each gene, hence two alleles encoding for the same gene.
What is the genotype of garden pea?
This study reports the development of a garden pea genotype ‘VRPM–901–5‘ producing five flowers per peduncle at multiple flowering nodes, by using single plant selection approach from a cross ‘VL-8 × PC-531’.
How can you tell if an allele is dominant or recessive?
Alleles can be considered dominant or recessive, with dominant being the trait that is observed or shown and recessive being the trait is not seen. Dominant alleles are seen as an uppercase of a letter; for example, B. Recessive alleles are seen as a lower case of a letter; b.
How do you know if its dominant or recessive?
Determine whether the trait is dominant or recessive.
If the trait is dominant, one of the parents must have the trait. Dominant traits will not skip a generation. If the trait is recessive, neither parent is required to have the trait since they can be heterozygous.
How is a recessive allele different from a dominant allele?
A dominant allele produces a dominant phenotype in individuals who have one copy of the allele, which can come from just one parent. For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent.
What causes wrinkled peas?
The high sugar content in the wrinkled seeds draws in large amounts of water by osmosis, causing the seed to swell. As the seeds dry out and lose volume they develop their famous wrinkled appearance.
Is wrinkled seeds a genotype or phenotype?
The shape of the pea seeds is controlled by two alleles. S is dominant alleles and stands for smooth and s is recessive allele and stands for wrinkled. The wrinkled phenotype is shown when the genotype contains both the recessive alleles. The genotype of the wrinkled seeds of pea is ss.
What is the recessive color of a pea plant’s seed coat?
green
Mendel’s experiments showed that green is the recessive seed color in pea plants.
Why is a trait recessive?
In the case of a recessive trait, the alleles of the trait-causing gene are the same, and both (recessive) alleles must be present to express the trait. A recessive allele does not produce a trait at all when only one copy is present.
Which of the following is a recessive trait?
Examples of Recessive Traits
Cleft chin, dimples, and freckles are similar examples; individuals with recessive alleles for a cleft chin, dimples, or freckles do not have these traits. Having round (as opposed to almond-shaped) eyes is recessive, along with inability to roll one’s tongue.
Which of the following is not a dominant trait in pea plant?
So, the correct option is ‘Pod colour – Yellow‘.
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