What are the two different genotypes for the albinism gene that result in the same phenotype explain how two people with different genotypes can have the same phenotype?
What are the two different genotypes for the albinism gene that result in the same phenotype? Explain how two people with different genotypes can have the same phenotype. AA and Aa result in the same phenotype. Aa produces enough of the normal enzyme and, therefore, the dominant phenotype masks the recessive phenotype.
Why does albinism result in the same phenotype?
The phenotypic heterogeneity of albinism is due to the different gene mutations affecting various points along the melanin pathway, resulting in varying degrees of decreased melanin production. Additionally, associated developmental changes occur in the optic system as a result from this hypopigmentation.
What is the genotype for albinism?
Hence a person of genotype a/a is an albino. The genotype A/a is interesting. It results in normal pigmentation because transcription of one copy of the wild-type allele (A) can provide enough tyrosinase for synthesis of normal amounts of melanin.
Can the same phenotype be caused by two different genotypes?
Different genotypes can produce the same phenotype. Different genotypes can produce the same phenotype.
Can you determine a genotype based on phenotype?
Today, scientists use the word “phenotype” to refer to what Mendel termed “external resemblance” and the word “genotype” to refer to an organism’s “internal nature.” Thus, to restate Mendel’s musing in modern terms, we cannot infer an organism’s genotype by simply observing its phenotype.
Can 2 albinos have a normal child?
Two carriers have a 25% chance of having an unaffected child with two normal genes (left), a 50% chance of having an unaffected child who also is a carrier (middle), and a 25% chance of having an affected child with two recessive genes (right).
Do albinos smell?
Close relatives of Caucasian albinos have described to me their odor as sour, fishy and fetid. A Cuna Indian mother of both albino and brown-skin children said that she could wash her albino babies with soap and immediately they smelled as though they had not been washed for two weeks.
How many albinos are killed in Africa?
Current statistics of persecution of albinistic people
Titled Reported Attacks of Persons with Albinism, the document reviews 180 countries and lists 129 recent killings and 181 other attacks, all within 23 African countries.
What are the 4 types of albinism?
To date as many as seven forms of oculocutaneous albinism are now recognized – OCA1, OCA2, OCA3, OCA4, OCA5, OCA6 and OCA7. Some are further divided into subtypes. OCA1, or tyrosinase-related albinism, results from a genetic defect in an enzyme called tyrosinase.
Is there a cure coming soon for albinism?
Because albinism is a genetic disorder, it can’t be cured. Treatment focuses on getting proper eye care and monitoring skin for signs of abnormalities.