Explore BrainMass

DNA, Chromosomes and the Genomes

Describe the process of transcription in eukaryotes.

What is involved in going from genomic DNA to messenger RNA (mRNA)? The transciption process involves the concerted action of several proteins called transcription factors which process the DNA in a multi-step process into mRNA.

After three bouts of replication, how many new molecules

Two strands of a DNA molecule are radio-labeled such that each strand can be uniquely identified. After three bouts of replication, how many new molecules of DNA are formed? How many strands of DNA are radio-labeled? Are both radio-labeled strands in the same DNA molecule? Why or why not?

Motif finding

Question 2: Motif finding Try a number of motif-finding algorithms covered in the lab, and try different parameters. What good motif can you find from the sequence? Here are some useful hints for the analysis (depends on the software you are using): ? Motif width ~ 13, and search in both strands of the DNA ? Ask each algori

DNA sequencing

Predict Functional Domain of DNA Sequence. See attached file for full problem description.

Ecosystem Services - Biodiversity

What are ecosystem services? How would you respond to the critic who says, "Forests are only good for providing timber"? Support your answer with examples of at least four different ecosystem services offered by forests. Define genetic diversity and explain the importance of genetic diversity for crop plants and livestock. I

Genetics/Meiosis questions

How many types of telophase II products can be formed if a homozygote (AA or aa) is under study? How many types of telophase II products can be formed if a heterozygote (Aa) is under study? How many kinds of gametes can be formed if the genotype is AABB? Make a drawing of this type of cell in Prophase I. Label the chromo

Tetrahybrid cross: probabilities of genotypes

The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the probabilities that F2 offspring will have the following genotypes? a)aabbccdd b)AaBbCcDd c)AABBCCDD d)AaBBCcDd e)AaBBCCdd Please help me on tackling problems like this in a systematic wa

Using Rules of Probability to Solve Genetics Problems

I'm totally lost in this subject especially when i have to solve problems using probability for trihybrid. I have of not knowing when to use the Rule of Addition and when to us the rule om Multiplication. I will try to show you what i know and maybe you can help me impron on what i already know. R r R(RR)(Rr) r(r

Describe the Control of Gene Expression

Question 1: Describe the control of gene expression In the Andalusian fowl, the allele for black feathers (B) is incompletely dominant to that for white feathers (b) and the phenotype of the heterozygote is described as blue. The texture of the feathers is controlled by a second gene locus, silky feathers (f) being recessive

Genetics: DNA and Chromosome Problems

1. Each cell of the human body contains 46 chromosomes. a. How many DNA molecules does this statement represent? b. How many different types of DNA molecules does it represent? 2. DNA is extracted from cells of Neurospora, a fungus that has one set of seven chromosomes; pea, a plant that has two sets of seven chromoso

Different single-stranded RNA's are composed of 99 nucleotides

If there are 20 amino acids commonly found in protiens, how many different dipeptides are there? How many different tripeptides? How many different trinucleotides(remember that nucleotides are the building blocks of DNA+RNA)?How many different single stranded RNA's are composed of 99 nucleotides?


The Planning, Research and Development, Corp. is seeking grant money to continue their investigation on the relationship between DNA and heredity. You want it apply for the grant money to continue your internship research project. You thought it would help your case if you research projects where DNA research is being applied wi

The Histone Code

What is meant by the "histone code"? Describe the parts of histones involved, their variations, and their general purpose.

I have to come up with a hypothesis and suggest an experiement utilizing mtDNA

I have not clue where to start on this or how to go about it. Apart from its essential role in cellular respiration, the mitochondrion is thought to be implicated in a variety disease states as well as the process of ageing. The mitochondrion contains its own circular DNA molecules (termed mtDNA) which largely encodes for pr

Various biology questions

1) Through a series of experiments with sterilized broth, Louis Pasteur disproved the idea of what? 2) To make a specific protein, ribosomes, a set of twenty strands of tRNA, and a strand of messenger RNA work together in a process called what? 3) The process by which a web-spinning spider makes a "sketch" of a web design

Probability Assumptions in Mating Pedigrees

(see diagram in the attached file) Answer the following questions based on the assumption that genotypes BB and Bb have brown eyes, while bb has blue eyes. Filled in the symbols in the pedigrees that represent blue eyes. a) What is the probability that the first child of a mating between II-2 and II-7 would be a blue-eyed


Answer the following questions based on the assumption that genotypes BB and Bb have brown eyes, while bb has blue eyes. Filled in the symbols in the pedigrees that represent blue eyes. a) What is the probability that the first child of a mating between II-2 and II-7 would be a blue-eyed girl? b) What is the probability th

DNA is discussed in plants and animals

There are a number of natural types of DNA. One is animal DNA, one plant DNA, another bacterial DNA. There are two types of DNA (one in plants and one in animal cells) that are part of cells but are not the main blueprint (not found in the nucleus) for the cell. What are these two types of DNA? Ideas are expressed.

Green fluorescent protein is emphasized.

This job names three DNA features that are necessary to make a green fluorescent protein (GFP) reporter construct and indicates which of these controls the tissues in which GFP will be expressed if the construct is used to make a transgenic mouse.

Genomic Library

You are provided with the following two mouse libraries: - a genomic library in a bacteriophage lambda vector with inserts prepared from muscle cell DNA - a genomic library in a YAC vector with inserts prepared from liver cell DNA. a) Would you expect any differences in the types of DNA sequences represented in the two li

Transcripts Gene Expressions

Eukaryotes may regulate gene expression at any number of levels. Imagine that transcripts of gene A are found only in the developing liver and transcripts of gene B are found only in the developing eye. List a general type of cis-regulatory sequence difference that could explain the expression difference between the two genes

Restriction Enzyme DNA

The restriction enzyme ECOR I cuts DNA leaving 5' overhangs, Pst I leaves 3' overhangs after cutting DNA and SMA I leaves blunt ends on the fragments it produces.Indicate wheter DNA ligase can join the following pieces of DNA. a) a fragment of human DNA that was generated by cutting with Ecor I and a plasmid DNA that was also c

Hybridization experiment involving complimentary gene

You cross two true breeding strains of zucchini, one with green fruit and the other with yellow. The F1 plants are all green , but when these are crossed, the F2 plants consists of 9 green and 7 yellow. How many genes are involved in determining the zucchini color? Using your own symbols, designate which genotypes yield green an

Gene linkage

The following cross involving three genes was performed: Aa Bb Cc x aa bb cc, and the phenotypes and number of progeny are shown below. Each pair of alleles exhibits simple dominance and recessiveness. Progeny Phenotype Number of progeny A B C 181 a b c 169 a B

This job features tyrosine kinase.

In a series of experiments, genes that code for mutant forms of a receptor tyrosine kinase are introduced into cells. The cells also express their own normal form of the receptor from their normal gene, although the mutant genes are constructed so that they are expressed at considerably higher concentrations than the normal gen

Corn plants, mutant mouse

7. In corn plants, a dominant allele "I" inhibits kernel color, while the recessive allele "i" permits color when homozygous. At a different locus, the dominant gene "P" causes purple kernel color, while the homozygous recessive genotype pp causes red kernels. If plants heterozygous at both loci are crossed, what will be the ph

The use of DNA techniques in forensic science

In forensic analysis using STR systems, up to 16 different loci can be tested in a single PCR reaction. Why is it important for forensic analysis that each locus being tested is present on a different chromosome? Ideas are justified.

Problem Set

(See attached file for full problem description) --- 1. In the following pedigree, assume no outsiders marrying in carry a disease allele. A. What is the mode of inheritance of this disease? Circle one. (1 point) Autosomal dominant; Autosomal recessive; X-linked dominant; Y-linked; mitochondrial inheritance;