genotype = the genes of an organism; for one specific trait we use two letters to represent the genotype. A capital letter represents the dominant form of a gene (allele), and a lowercase letter is the abbreviation for the recessive form of the gene (allele).
What does a genotype contain?
In a broad sense, the term “genotype” refers to the genetic makeup of an organism; in other words, it describes an organism’s complete set of genes. In a more narrow sense, the term can be used to refer to the alleles, or variant forms of a gene, that are carried by an organism.
How many letters do alleles have?
Alleles may be designated by a single capital or lower case letter (e.g., L is the symbol of Lobe eye in Drosophila) or by two , three or more letter or letter/number combinations (Wr – Wrinkled, per – periodicity). Alleles may have superscripts (wa) or subscripts (A1) or both.
Can As marry as?
They refer to the hemoglobin gene constituents on the red blood cells. AC is rare whereas AS and AC are abnormal. Compatible genotypes for marriage are: … AS and AS should not marry, there is every chance of having a child with SS.
Is AA a genotype?
What is a Genotype? … There are four hemoglobin genotypes (hemoglobin pairs/formations) in humans: AA, AS, SS and AC (uncommon). SS and AC are the abnormal genotypes or the sickle cells. We all have a specific pair of these hemoglobin in our blood which we inherited from both parents.
What are 3 exceptions to Mendel’s observations?
- Multiple alleles. Mendel studied just two alleles of his pea genes, but real populations often have multiple alleles of a given gene.
- Incomplete dominance. …
- Codominance. …
- Pleiotropy. …
- Lethal alleles. …
- Sex linkage.
What are the 3 types of genotypes?
There are three types of genotypes: homozygous dominant, homozygous recessive, and hetrozygous.
Is YY genotype possible?
Yy is the heterozygous genotype (one dominant allele, one recessive allele). The phenotype of this genotype is yellow seed color. yy is the homozygous dominant genotype (2 y alleles). … So, a YY genotype can only produce gametes with Y alleles.
Which allele is always written first?
The alleles are represented by letters. The letter chosen is usually the first letter of the trait.