EBK BIOLOGY NOW
EBK BIOLOGY NOW
15th Edition
ISBN: 9780393918953
Author: HOUTMAN
Publisher: W.W.NORTON+CO. (CC)
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Chapter 6, Problem 11TQ

a.

Summary Introduction

To define:

At the hair length and furnishings genes, what is the correct genotype of the long-haired dog without furnishings?

Concept introduction:

Genes influence the physical, behavioral, and biochemical traits of all organisms. Genes transfer genetic information from one generation to another. Alleles are different versions of a gene. If the genotype contains two different alleles of a gene, it is known as heterozygous for that particular gene. If the genotype contains two copies of the same allele (two similar alleles of a gene), it is known as homozygous for that particular gene.

b.

Summary Introduction

To define:

At the hair length and furnishings genes, what are all the possible genotypes of the short-haired dog with furnishings?

Concept introduction:

Genes influence the physical, behavioral, and biochemical traits of all organisms. Genes transfer genetic information from one generation to another. Alleles are different versions of a gene. If the genotype contains two different alleles of a gene, it is known as heterozygous for that particular gene. If the genotype contains two copies of the same allele (two similar alleles of a gene), it is known as homozygous for that particular gene.

c.

Summary Introduction

To define:

Create the Punnett square of two dogs having heterozygous genotype for hair length and furnishings. What is the phenotype ratio of the offspring for those two traits?

Concept introduction:

Genes influence the physical, behavioral, and biochemical traits of all organisms. Genes transfer genetic information from one generation to another. Alleles are different versions of a gene. If the genotype contains two different alleles of a gene, it is known as heterozygous for that particular gene. If the genotype contains two copies of the same allele (two similar alleles of a gene), it is known as homozygous for that particular gene.

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A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation?   The cell membranes are more resistant than normal.   An isotonic solution had been added instead of water.   A solution of 0.1 M NaCl had been added instead of water.   Not enough water had been added to the red blood cell pellet.   The man had sickle-cell anaemia.
A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation?   The cell membranes are more resistant than normal.   An isotonic solution had been added instead of water.   A solution of 0.1 M NaCl had been added instead of water.   Not enough water had been added to the red blood cell pellet.   The man had sickle-cell anaemia.
With reference to their absorption spectra of the oxy haemoglobin intact line) and deoxyhemoglobin (broken line) shown in Figure 2 below, how would you best explain the reason why there are differences in the major peaks of the spectra? Figure 2. SPECTRA OF OXYGENATED AND DEOXYGENATED HAEMOGLOBIN OBTAINED WITH THE RECORDING SPECTROPHOTOMETER 1.4 Abs < 0.8 06 0.4 400 420 440 460 480 500 520 540 560 580 600 nm 1. The difference in the spectra is due to a pH change in the deoxy-haemoglobin due to uptake of CO2- 2. There is more oxygen-carrying plasma in the oxy-haemoglobin sample. 3. The change in Mr due to oxygen binding causes the oxy haemoglobin to have a higher absorbance peak. 4. Oxy-haemoglobin is contaminated by carbaminohemoglobin, and therefore has a higher absorbance peak 5. Oxy-haemoglobin absorbs more light of blue wavelengths and less of red wavelengths than deoxy-haemoglobin
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