Homozygous Plants Mendel found that one kind of pea plant always had tall offspring. These plants had two tall genes, one from each parent. Mendel called these plants homozygous tall.
What 2 genes do all short pea plants have?
A pea plant with one recessive gene for shortness and one dominant gene for tallness is a hybrid for that trait. A hybrid is called heterozygous, as it has two different alleles.
| Dominant | Recessive |
|---|---|
| Brown eyes | Blue eyes |
| Curly hair | Straight hair |
| Freckles | No freckles |
| Nearsighted eyes | Normal eyes |
What is the genetic name of pea plant?
Pisum sativum
The scientific name of the pea plant is Pisum sativum.
What is the gene for tallness in pea plants?
(T)
The gene for tallness (T) is dominant over the gene for shortness (t) in pea plants. A homozygous dominant pea plant is crossed with a heterozygous pea plant, and 200 seeds are produced.
How many genes does a pea plant have?
Because Mendel used seven genes and peas have seven pairs of chromosomes, it is tempting to think that each gene is on a different chromosome, especially given that Mendel reported that the genes were inherited independently of each other.
Is TT tall or short?
tall
What is the phenotype of a pea plant that is homozygous dominant ( TT ) for the tall trait? Tall.
| Genotype | Definition | Example |
|---|---|---|
| Homozygous dominant | Two dominant alleles | TT |
| Homozygous recessive | Two recessive alleles | tt |
Is tall height dominant or recessive?
recessive trait
For example, the gene for having an extra finger is actually dominant, while the gene for having a tall stature is a recessive trait.
What happened when Mendel crossed two traits of a character in a pea plant?
Answer: Mendel also experimented to see what would happen if plants with 2 or more pure-bred traits were cross-bred. He found that each trait was inherited independently of the other and produced its own 3:1 ratio. This is the principle of independent assortment .
What did Mendel call the two kinds of traits exhibited by the 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.
What does it means when multiple genes determine a trait?
A polygenic trait is a characteristic, such as height or skin color, that is influenced by two or more genes. Because multiple genes are involved, polygenic traits do not follow the patterns of Mendelian inheritance. Many polygenic traits are also influenced by the environment and are called multifactorial.
Which is a 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.
Why are some pea plants tall and short in nature?
The pea plant will grow taller if the gene sequence is such that it creates a hormone that impacts the height attribute. If the gene sequence is in such a way that this hormone is only produced in little amounts and is controlled by specific conditions, it will have no effect on height growth. It will be a short plant.
What 2 genotypes give an organism a dominant phenotype?
This means that the genotype of an organism with a dominant phenotype may be either homozygous or heterozygous for the dominant allele.
What do you call the pair of genes?
A pair of genes are called a pair of alleles and it is referred to as the genotype. If a person contains a pair of the same alleles, then it is called homozygous and if the two alleles are different it is termed as heterozygous.
Why does Mendel choose pea plant?
Solution: Pea plants were chosen for Mendel’s experiments because they are easy to grow, have a short life period, and produce larger flowers. Pea plants are also self-pollinated.
What trait in pea plants is being crossed?
What trait in pea plants is being studied in the cross shown above? The trait that is being studied is the height of the pea plants.
What is phenotype of TT?
The phenotype of a plant with the genotype Tt would be tall. Here tallness (T) is a dominant trait over dwarfness (t), which is recessive. Tallness and dwarfness (stem height) are one of the seven contrasting pairs of traits in pea plants studied by Mendel.
What are the 3 types of genotypes?
The different types of genotypes are- homozygous recessive (pp), homozygous dominant (PP), and heterozygous (Pp).
What is TT genotype?
The notation Tt means the heterozygous condition, wherein the homologous pair contains different alleles of a gene. One homologous chromosome possesses the dominant allele and the other chromosome possesses the recessive allele present for a gene. Alleles are slightly different forms of one gene.
Why Am I taller than my parents?
Your height is mainly dictated by genetics, however there are some things you can’t blame your parents for. While your final height is dictated chiefly by the genes you inherit from your parents, factors like nutrition and disease account for around 20 per cent of the height variation between people.
Are humans getting taller?
In fact, over the last 150 years the average height of people in industrialized nations has increased approximately 10 centimeters (about four inches).
Elvira Bowen is a food expert who has dedicated her life to understanding the science of cooking. She has worked in some of the world’s most prestigious kitchens, and has published several cookbooks that have become bestsellers. Elvira is known for her creative approach to cuisine, and her passion for teaching others about the culinary arts.