Which two combinations of alleles could produce a trait controlled by a dominant allele? A trait controlled by a dominant allele will be produced if there are two dominant alleles present (homozygous dominant) or one dominant allele and one recessive allele (heterozygous). You just studied 71 terms!
What combination of alleles will produce a recessive trait?
Recessive alleles are denoted by a lowercase letter (a versus A). Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait.
What do two alleles produce?
In a diploid organism, one that has two copies of each chromosome, two alleles make up the individual’s genotype. An example is the gene for blossom color in many species of flower — a single gene controls the color of the petals, but there may be several different versions (or alleles) of the gene.
What combination or combinations of alleles could produce white flowers?
What combination or combinations of alleles could produce white flowers? A snapdragon produces either yellow or white flowers. The dominant allele (Y) produces yellow flower color and the recessive allele (y) produces white color.
Which allele is always written first?
The alleles are represented by letters. The letter chosen is usually the first letter of the trait.
How many alleles are in a gene?
An allele is one of two or more versions of a gene. An individual inherits two alleles for each gene, one from each parent. If the two alleles are the same, the individual is homozygous for that gene.
How are alleles named?
Allele designations appear as superscripted short alphanumeric strings following the gene symbol of which they are an allele and serve as an acronym for the allele name. … Allele designations begin with a lower case letter if the allele is a recessive and begin with a capital letter otherwise.
What are the two alleles for flower color?
5. In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (R’). The heterozygous genotype is expressed as pink.
Which flower color is recessive?
|Trait||Dominant Expression||Recessive Expression|
|Color of flower (P)||Purple||White|
|Form of ripe pods (I)||Inflated||Constricted|
|Color of unripe pods (G)||Green||Yellow|
|Position of flowers (A)||Axial||Terminal|
Do alleles separate when forming gametes?
1: The Law of Segregation states that alleles segregate randomly into gametes: When gametes are formed, each allele of one parent segregates randomly into the gametes, such that half of the parent’s gametes carry each allele.