Q. Which mutation did not result in a change in the phenotype?
The only mutations that matter to large-scale evolution are those that can be passed on to offspring. These occur in reproductive cells like eggs and sperm and are called germ line mutations. No change occurs in phenotype.
Q. Which mutation is the most likely to result in no effect to the phenotype of a cell?
Correct – silent mutations change the genetic code of the DNA, but do not result in changes to the protein function. Therefore, the phenotype of the organism is not affected.
Q. What type of mutations affect the phenotype?
For a recessive mutation to give rise to a mutant phenotype in a diploid organism, both alleles must carry the mutation. However, one copy of a dominant mutant allele leads to a mutant phenotype. Recessive mutations result in a loss of function, whereas dominant (more…)
Q. Will all mutations result in a phenotypic change?
A mutation is a random change in DNA which therefore affects a gene and/or chromosome . Most mutations have no effect on the phenotype. Very few create a new phenotype. Mutations can be inherited and therefore passed on from one individual to another.
Q. What country has most birth defects?
According to the report, Sudan has the most birth defects, with 82 per 1,000 live births, compared with 39.7 in France, which had the lowest number among the 193 countries surveyed.
Q. Does autism improve with age?
A new study found that some children correctly diagnosed with autism spectrum disorders (ASD) at an early age may lose symptoms as they grow older. Further research may help scientists understand this change and point the way to more effective interventions.
Q. Does autism come from the mother or father?
There is no one gene that, when mutated, causes autism. But over the past decade, researchers have identified hundreds of gene variations that seem to affect brain development in ways that increase the risk of autism.
Q. Is autism considered a special need?
Answer: No, autism spectrum disorder (ASD) isn’t a learning disability. But it does affect learning — sometimes in ways like learning disabilities. And kids who have autism are often eligible for special education services.
Q. How can you tell if someone has autism?
Common signs of autism
- Avoiding eye contact.
- Delayed speech and communication skills.
- Reliance on rules and routines.
- Being upset by relatively minor changes.
- Unexpected reactions to sounds, tastes, sights, touch and smells.
- Difficulty understanding other people’s emotions.
