Table of Contents
Are all mutations recessive?
It is a long-standing observation that most mutations are recessive. That is, they do not lead to visible phenotypic effects when in heterozygous combination with the wild-type allele.
What is an example of a germ mutation?
A germ cell mutation is any detectable and heritable variation in the lineage of germ cells. An example of a chromosome mutation in a sex cell would be trisomy 21 (aka downs syndrome), where a sex cell has an extra chromosome due to a homologous pair of chromosomes failing to separate during meiosis.
Which situation would be most likely to cause a DNA mutation?
Answer Expert Verified. The correct answer is option D, that is, a person spends one hour each day under the ultraviolet rays of a tanning bed. The UV, or ultraviolet light from the sun, us a non-ionizing radiation that can cause DNA mutations. It does this by making the formation of pyrimidine dimers.
Which gene mutation is most harmful?
Frameshift mutations are generally much more serious and often more deadly than point mutations. Even though only a single nitrogen base is affected, as with point mutations, in this instance, the single base is either completely deleted or an extra one is inserted into the middle of the DNA sequence.
What is the difference between a gene mutation and a chromosomal mutation?
What is the difference between a gene mutation and a chromosomal mutation? A gene mutation affects a single gene, and is usually caused by a replication error. A chromosomal mutation affects part or all of a chromosome, and is usually caused by an error in meiosis. A mutation is a change in DNA.
Which is worse chromosomal or gene mutation?
A chromosomal mutation is worse than a gene mutation because in a chromosomal mutation it effects more than one gene but in a gene mutation it effects in only 1 gene. It a mutation occurs in a body cell it can’t be passed onto the offspring.
Which type of mutation can take genes away from a chromosome?
Why is deletion mutation harmful?
Because an insertion or deletion results in a frame-shift that changes the reading of subsequent codons and, therefore, alters the entire amino acid sequence that follows the mutation, insertions and deletions are usually more harmful than a substitution in which only a single amino acid is altered.
What does deletion mean?
something is missing