A dominant trait is one that shows up in an individual, even if the individual has only one allele”>allele that produces the trait. … An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB.
Is genotype dominant or recessive?
Alleles of the same gene are either autosomal dominant or recessive. An autosomal dominant allele will always be preferentially expressed over a recessive allele. The subsequent combination of alleles that an individual possesses for a specific gene is their genotype.
What kind of trait is genotype?
Within an individual organism, the specific combination of alleles for a gene is known as the genotype of the organism, and (as mentioned above) the physical trait associated with that genotype is called the phenotype of the organism.
Which genes are dominant?
An allele of a gene is said to be dominant when it effectively overrules the other (recessive) allele. Eye colour and blood groups are both examples of dominant/recessive gene relationships.
Why can’t we tell a person’s phenotype from his her genotype?
You can’t tell a person’s phenotype from his/her genotype because some alleles may be sex-linked or co-dominant, and this won’t show in the phenotype of an organism.
Can ones genotype change?
Genotype generally remains constant from one environment to another, although occasional spontaneous mutations may occur which cause it to change. However, when the same genotype is subjected to different environments, it can produce a wide range of phenotypes.
Can As marry AA?
It is safe for someone with AS to marry someone with AA genotype. Two sickle cells should not even have a relationship or get married. Individuals with the AA genotype should help you prevent genetic abnormalities by marrying the AS, AC, and SS. Compatible genotypes for marriage are: AA marries an AS.
Can a person’s genotype be determined by their phenotype?
No, a person’s genotype cannot be determined solely by their phenotype as many genes in our genome do not get expressed.
How do you determine a dominant trait?
To identify whether an organism exhibiting a dominant trait is homozygous or heterozygous for a specific allele, a scientist can perform a test cross. The organism in question is crossed with an organism that is homozygous for the recessive trait, and the offspring of the test cross are examined.
Is tall a dominant trait?
A pea plant could have a copy of the height gene that coded for “tall” and a copy of the same gene that coded for “short.” But the tall allele is “dominant,” meaning that a tall-short allele combination would result in a tall plant. … Many traits — eye color, for example — are influenced by many genes.