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 phenotype of the pea plant?
For the pea plants, if the red allele is dominant and the white allele is recessive, only two phenotypes are possible. Both the plants with red-red and red-white genotypes will have the red phenotype, while the plants with the white-white genotype will have the white phenotype.
What is the genotype of wrinkled phenotype of pea seed?
rr
So, the wrinkled phenotype of pea seed is given by double recessive ‘rr’ genotype.
Is wrinkled seed shape a phenotype?
One of the traits studied by Mendel in pea (Pisum sativum L.) was the wrinkled-seeded phenotype, and the molecular basis for a mutation underlying this phenotype was discovered in the 1990s.
What causes the wrinkled seed phenotype?
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.
How many phenotypes do pea plants have?
seven distinct
Key Points. Mendel used pea plants with seven distinct traits or phenotypes to determine the pattern of inheritance and the underlying genotypes.
What is the phenotype of this plant?
The phenotype of a plant is a term used to describe observable characteristics, such as height, biomass, leaf shape and so on. We use the term phenotype in a more specific context to describe the collective expression of the genotype in conjunction with the environment on a plant’s observable characteristics.
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.
Why does a pea plant with the genotype RR have wrinkled seeds?
Wrinkled peas need to have genotype rr, since the wrinkled trait (r) is recessive.
What is the phenotype in a round seeds dominant to wrinkled seeds?
The round seeds are dominant and wrinkled seeds are recessive. Thus, in the first filial generation (F1), when the homozygous round (RR) is crossed with homozygous wrinkled (rr), then the resulting offspring is produced with a genotype Rr which is heterozygous dominant genotype.
What is the phenotype of a purple flower pea plant?
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.
Is a phenotype?
Phenotype
Phenotype refers to an individual’s observable traits, such as height, eye color and blood type. A person’s phenotype is determined by both their genomic makeup (genotype) and environmental factors.
What is the phenotype of a plant with the genotype RR?
For this plant, the genotype for leaf color is RR , which is homozygous dominant, consisting of two dominant alleles. Since the only allele possible is dominant, the plant will express the dominant phenotype, which is red leaf color.
Why Mendel’s peas are wrinkled?
Some peas have a wrinkled appearance due to stretching of the seed coat during development. Image supplied by Dr Trevor Wang, the John Innes Centre. Gregor Mendel, an Austrian monk who studied inheritance in round and wrinkled peas. Image supplied by the John Innes Centre Historical Collection.
How does the wrinkled gene makes Mendel peas wrinkled?
The wrinkled-seed character of pea described by Mendel is caused by a transposon-like insertion in a gene encoding starch-branching enzyme. Cell.
What was the outcome when Mendel crossed a round and wrinkled seed?
All the haploid sperm and eggs produced by meiosis received one chromosome 7. All the zygotes received one R allele (from the round parent) and one r allele (from the wrinkled parent). Because the round trait is dominant, the phenotype of all the seeds was round.
What is the genotype and phenotype?
A person’s genotype is their unique sequence of DNA. More specifically, this term is used to refer to the two alleles a person has inherited for a particular gene. Phenotype is the detectable expression of this genotype – a patient’s clinical presentation.
What is the phenotypic ratio?
A phenotypic ratio is a quantitative relation between phenotypes showing the number of times the frequency of one phenotype correlates with another. When a researcher would like to obtain the gene expression for generations of an organism, they use the phenotypic ratio obtained from a test cross.
What are the types of phenotypes?
Examples of phenotypes include height, wing length, and hair color. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
What is the phenotype of garden pea plant with genotype TT?
tall plant
As the given genotype is Tt , it’s a heterozygous condition and in heterozygous condition the dominant trait (T – tall) will express itself. Hence, the phenotype of Tt will be a tall plant.
What determines a plants phenotype?
In the above studies, plant phenotypes are controlled simultaneously by its genetic makeup and environmental stress. While in the common garden with consistent environmental stimulation, the differences of plant phenotypes are ultimately driven by its genotype.