Genetics Answers

A pre-mRNA must be processed to produce the final mRNA product of a gene-which of the following is NOT a normal processing step?

a)Splicing out of any introns

b)Addition of a ribosome binding site

c)Addition of a 5' cap

d)Addition of a 3' poly(A) tail

A breed of domestic rabbits can have brown, silver or white fur. These colours are produced by two alleles C^s and C^w. Draw a complete genetic diagram to predict the ratio of offspring produced by a cross with a silver of Brown rabbits

How do the different types of mutations affect the amino acid sequence of a polypeptide?

why some kids in a family might have albinism and others might not?

The answer should be 8-10 sentences and must include the following words:

DNA

gene

protein

melanin

mutation

chromosome

meiosis

crossing over

dominant

recessive

heterozygous

homozygous recessive

In an experiment, an animal with a genetic disorder is given gene therapy treatment . For a time, the animal's condition improves, but then a relapse occurs. (a) What has most likely happened ? (b) What must be done to make the improvements in the animal's condition long lasting ?

1. Tall is dominant, T, to short, t. Light skin is dominant, L, to dark skin, l. A homozygous for tall and dark skin male conceives with a short and heterozygous for light skin female. Calculate the genotypic and phenotypic ratios of the offspring

Explain why the genetic code would not work if nucleotide bases were arranged in pairs rather than in triplets, to make the coding units.

The genetic code consists of 3-letter words. What does this mean?

There are 2 main classes of mutations : (i) Point mutations, (ii) Insertion/deletion mutations.

In groups of 3, research and state how each of these mutations can alter the DNA sequence.

What type of diseases can result from DNA copying going wrong?