Alberta Homework Help Board From TutorTag

Posted 4 years ago by chan in Biology 20 | 1 answers
#ecocsystems and population change

It has been determined that fluoride can prevent the decay of tooth enamel. Historically, tin(II) fluoride was added to toothpaste to help combat tooth decay. Titration analysis was used to determine the concentration of tin(II) fluoride in a NMmple of toothpaste. A 10.0 mL sample of tin(II) fluoride solution was acidified and titrated with 0.0100 mol/L potassium dichromate solution as represented by the following equation.

3Sn2+(aq)+Cr2O2−7(aq)+14H+(aq)→3Sn4+(aq)+2Cr3+(aq)+7H2O(l)

Trial I II III IV Final Volume (mL) 9.39 16.93 23.61 30.32 Initial Volume (mL) 2.85 9.39 16.93 23.61 Volume Used (mL)

a.The moles of Cr2O72-(aq) that reacted, expressed in scientific notation, is a.bc x 10-dmol. The values of a, b, c and d are

b.The concentration of Sn2+(aq), expressed in scientific notation, is a.bc x 10-d mol/L. The values of a, b, c and d are

Posted 4 years ago by noure2 in Chemistry 30 | 1 answers
#chemistry 30

Feather colour in parakeets is controlled by two genes. Blue colour (B) is dominant over absence of colour (b). Yellow colour (Y) is dominant over absence of colour (y). When a B allele and a Y allele are present, a green parakeet is produced. What is the percent probability of obtaining a yellow or blue parakeet when a heterozygous green parakeet is crossed with a white parakeet? What are the genotypes of the parents?

Posted 4 years ago by msather in Biology 30 | 1 answers
#polygenic traits #genetics and probability

Show that P(x)/x-a = Q(x)+ R/x-a can be rearranged to P(x)= Q(x)(x-a)+R

Posted 4 years ago by sandhu123 in Math 30-1 | 2 answers
#polynomials

Helium for balloons is often stored in steel containers. Under what pressure is helium in a 10.0 L cylinder at room temperature (25 degrees Celsius) if 350 g of He are held

Posted 4 years ago by Sumaira in Chemistry 20 | 1 answers
#stochiometry

Explain how Soviet communism could be viewed as a rejection of liberal values

Posted 4 years ago by Paule in Social Studies 30-2 | 1 answers
#hitler #ideologies

To what extent does providing universal healthcare for all citizens represent socialist and or modern liberal values

Posted 4 years ago by Paule in Social Studies 30-2 | 1 answers
#ideologies

During meiosis, homologous chromosomes synapse and form tetrads. In a homologous pair, one of the chromosomes comes from the mother (maternal homologue) and one comes from the father (paternal homologue).Since replication occurs before meiosis, each tetrad consists of four chromatids (tetra means four). The chromatids of the same homologue are called sister chromatids, and the chromatids of different homologues are called non-sister chromatids.If the maternal homologue carries allele A and the paternal homologue carries allele a for a certain gene, which of the following will have different alleles for this gene?

Select one:

a. Non-sister chromatids

b. Sister chromatids

c. None of the chromatids, since each chromatid in a tetrad contains the same allele

d. All four chromatids, since each chromatid in a tetrad has a different allele

Germ cells are specialized cells that develop into gametes. Gametes are produced through the process of meiosis.If the diploid number for humans is 46 chromosomes, how many chromatids does a cell undergoing meiosis have at each of the following phases?Select the row that correctly shows the number of chromatids at each phase.

Select one:

a. G2 of Interphase Metaphase I Prophase II 92 92 46

b. G2 of Interphase Metaphase I Prophase II 46 92 23

c. G2 of Interphase Metaphase I Prophase II 92 46 46

d. G2 of Interphase Metaphase I Prophase II 46 46 23

In an organism with a diploid number of 16, how many chromatids are present in each of the following phases:

Answer

Mitotic metaphase Meiotic metaphase I Meiotic metaphase II

The diploid chromosome number of a cat, Felis catus, is .Which of the following rows correctly identifies the number of egg cells and chromosomes in each cell after the process of oogenesis has completed?

Select one:

a. # of Cells # of Chromosomes

b. # of Cells # of Chromosomes

c. # of Cells # of Chromosomes

d. # of Cells # of Chromosomes

Use the following information to answer the next two questions.Nondisjunction is an error in meiosis that results in non-separation of chromosomes during anaphase. Nondisjunction can occur during anaphase I or anaphase II of meiosis.

Which of the following correctly describes the gametes that will form as a result of nondisjunction during anaphase II in a human male?

Select one:

a. Four sperm with chromosomes

b. Two sperm with chromosomes, one sperm with chromosomes, and one sperm with chromosomes

c. Two sperm with chromosomes and two sperm with chromosomes

d. Four sperm with chromosomes

Which of the following statements is true?

Select one:

a. More gametes will be affected if nondisjunction occurs during anaphase I than if nondisjunction occurs during anaphase II.

b. Nondisjunction during anaphase I or anaphase II will have the same effect.

c. More gametes will be affected if nondisjunction occurs during anaphase II than if nondisjunction occurs during anaphase I.

d. Nondisjunction during anaphase I or anaphase II will have no effect on the gametes formed.