What is recessive and dominant gene?explain?

Question

Answer

•Dominant gene are gene which express in first generation in very effective way, ex ->TT
•Recessive gene are gene which are unexpressed or hidden in first generation, ex-> tt.

Answer

A dominant allele becomes a trait even if just one copy of it is present. A recessive allele does not become a trait unless both copies of the gene, one from mom and one from dad, are present. If one dominant allele and one recessive allele are present,the dominant allele trait will be expressed.

Answer

Donut refers to the realtionship between two version of gane individual receive two version of each gane known as alleles from each parent if the alleles of the gane are different one allele will be expressed it is dominant gane

Answer

Recessive and Dominant Genes

Genes are the units of heredity that determine the traits or characteristics of an organism. Each gene is composed of a specific sequence of DNA that codes for a particular protein. In sexually reproducing organisms, genes are inherited from both parents and can be either dominant or recessive.

Dominant Genes
- Dominant genes are those that are expressed or observed in an organism when at least one copy is present in the genotype.
- These genes override the expression of recessive genes.
- Dominant genes are generally represented by uppercase letters, while recessive genes are represented by lowercase letters.

Recessive Genes
- Recessive genes are those that are only expressed or observed in an organism when two copies are present in the genotype.
- They are masked or suppressed by the presence of dominant genes.
- Recessive genes are only expressed when there are no dominant genes present in the genotype.
- If a recessive gene is inherited from both parents, it will be expressed in the phenotype.

Punnett Square
- The inheritance of genes can be predicted using Punnett squares, which are a visual representation of the possible genotypes and phenotypes of offspring.
- The dominant gene is represented by a capital letter (e.g., A), while the recessive gene is represented by a lowercase letter (e.g., a).
- The Punnett square allows us to determine the probability of certain traits being expressed in offspring based on the genotypes of the parents.

Mendelian Inheritance
- The concept of dominant and recessive genes is based on the principles of Mendelian inheritance.
- Gregor Mendel, known as the father of genetics, conducted experiments with pea plants and observed the patterns of inheritance.
- He discovered that traits are inherited in predictable patterns and proposed the laws of segregation and independent assortment.

Example
- Let's consider the inheritance of eye color. Brown eye color is dominant (B) and blue eye color is recessive (b).
- If a person has the genotype BB, they will have brown eyes because the dominant gene overrides the recessive gene.
- If a person has the genotype Bb, they will also have brown eyes because the dominant gene is present.
- Only individuals with the genotype bb will have blue eyes because they have two copies of the recessive gene.

Conclusion
In summary, dominant genes are expressed in the phenotype when at least one copy is present, while recessive genes are only expressed when two copies are present. Understanding the concept of dominant and recessive genes allows us to predict the inheritance of traits and understand the patterns of genetic variation in populations.

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