(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 |
Why is allele for wrinkled seed shape in garden peas considered recessive?
Why is the allele for wrinkled seed shape in garden peas considered recessive? a. It “recedes” in the F2 generation when homozygous parents are crossed.
What is the genetic basis of wrinkled phenotype of pea seeds?
Solution: The tiny grain size produced by a double recessive allele is the genetic basis for the wrinkled phenotype of pea seed.
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.
What are the alleles in a pea plant?
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. The seed color we can observe is called the phenotype.
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 is dominant round or wrinkled seed shape?
In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy).
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.
Rr – Round seed (r- wrinkled is recessive) This is the genetic basis of wrinkled phenotype of pea seed.
Which is an example of a proper genotype phenotype pairing for peas?
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).
Why are some peas wrinkled?
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.
What is the genotype of the parent with round and wrinkled seeds?
A cross is made between plants with round seeds (RR) and plants with wrinkled seeds (rr). The two parents are homozygous, having one type of gamete each, i.e. R from round seed parent and r from wrinkled seed parent.
What is the probability that the offspring will have wrinkled seeds?
Since capital R = round and is dominant that means that RR and Rr will all be round seeds. That means that ¾ or 75% of the offspring produced will be round. Since, wrinkled is rr, then ¼ or 25% of the offspring will be wrinkled. The genotype is the gene make-up of the offspring.
What happened when Mendel crossed a round seed with a wrinkled?
In the F2 generation, the recessive traits reappeared, as did two novel combinations of traits: round green seeds, and wrinkled yellow seeds. From these results, Mendel concluded that characteristics were inherited independently of each other.
What is special about pea plant in genetics?
Mendel was curious about how traits were transferred from one generation to the next, so he set out to understand the principles of heredity in the mid-1860s. Peas were a good model system, because he could easily control their fertilization by transferring pollen with a small paintbrush.
What means allele?
An allele is one of two or more versions of DNA sequence (a single base or a segment of bases) at a given genomic location. An individual inherits two alleles, one from each parent, for any given genomic location where such variation exists. If the two alleles are the same, the individual is homozygous for that allele.
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.
Which is a dominant trait that Mendel observed in pea plants?
Mendel called the visible form the dominant trait and the hidden form the recessive trait. In the second generation, after plants were allowed to self-fertilize (pollinate themselves), the hidden form of the trait reappeared in a minority of the plants.
Is wrinkled dominant?
One of these factors is “dominant,” while the other is “recessive.” In the above example, the round-producing factor is dominant, and the wrinkled-producing factor is recessive.
How wrinkled seed is formed?
Increased sucrose concentration in the developing embryos of this mutant line causes increased uptake of water and thereby increases the cell size and fresh weight. During seed maturation in these mutant seeds a greater loss of water occurs. As a result, the wrinkled seed phenotype develops.
Is Round dominant over wrinkled?
In pea plants round seed is dominant over wrinkled seed. A plant heterrozygous for round seeds was crossed with a plant with wrinkeled seeds.
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