Question

gentic help and please explain.

true or false

3. for quantitatice traits that are under stabilizing selection, the aberage phenotype is being selected against resulting in a bimadal distribution

4.missense, neutral and nonsense mutations all lead to changes in amino acid sequence

5. modt chemicals that are carcinogens are also mutagens

Answer 1

Answers:

3. For quantitative traits that are under stabilizing selection, the average phenotype is being selected against resulting in a bimodal distribution

answer: Most of the quantitative traits such as height, birthweight, schizophrenia are under stabilizing selection and also it favors intermediate variants instead of extreme phenotypes. Hence given statement is True or correct

4. Missense, neutral and nonsense mutations all lead to changes in amino acids sequences

answer:

Missense mutation leads to a change in one amino acid in a protein which results causes point mutations in a single nucleotide.

Nonsense mutation: It refers to codon changed to premature termination i.e., stop codons and therefore, truncated protein.

Neutral mutation: According to evolutionary theory suggesting that large portion of DNA sequences in a species. Therefore, amino acid substitution take places in between species. Hence given statement is incorrect or False

5. Most chemicals that are carcinogens are also mutagens.

answer: All carcinogens are not mutagens. Therefore, carcinogens are not direct involved in damage of DNA molecules

Mutagens: It is a substances that change in genetic information of an organism by changes DNA sequences, it often causes cancer. Therefore, some of common mutagens are ethidium bromide, formaldehyde, dioxane, and nicotine. Hence given statement is incorrect or False.