Preview Material - Exam 2 Fall 2005

Preview Material for Exam 3 - Spring 2006
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G = rN

G = rN(K – N)

r = b – d

r = # of births - # of deaths

Kyle has a small ranch in western Oklahoma. He has enough land to support about 110 head of cattle. Last year he had 100 head of black cattle. Twenty-five calves were born, but only 20 survived because of the drought. To pay his expenses, he sold 5 cows to the local meat processing plant.

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On June 6 at approximately 1:00 p.m., Mrs. Smith, Mrs. Stevenson, and Mrs. Jones each delivered a healthy baby boy at the General Hospital. At 1:20 p.m., the town’s tornado alarms sounded. Nurses and orderlies scrambled to evacuate patients, and the three new babies to safety. After the danger had passed, the hospital staff was distressed to find that in the confusion, they had forgotten which baby was which! Since the babies were moved to safety before receiving their identification bracelets, there was no easy way to identify them.

Galactosemia is an autosomal recessive disorder. Babies with galactosemia lack the enzyme that converts galactose (one of two sugars found in lactose) into glucose, a sugar the body is able to use. As a result, milk (including breast milk) and other dairy products must be eliminated from the diet. Otherwise, galactose can build up in the system and damage the body's cells and organs, leading to blindness, severe mental retardation, growth deficiency, and even death.

Couples:	Blood type	Galactosemia

Mr. Stevenson	B	No – heterozygous
Mrs. Stevenson	B	No - heterozygous

Mr. Smith	A	Yes
Mrs. Smith	O	No – heterozgyous

Mr. Jones	A	Yes
Mrs. Jones	B	No - homozygous


Babies:
Baby Larry	B	Yes
Baby Moe	O	Yes
Baby Curly	A	No

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A particular herd of Rocky Mountain Elk in Beaverhead County, Montana, consists of 300 individuals and is restricted by mountains to a range of 100 square miles. Over a year, 200 calves were born and 125 animals died.

mRNA-Codon-to-Amino-Acid Decoder Chart
		2^nd Letter
1^st Letter	U		C		A		G		3^rd Letter
U	UUU UUC	Phenylalanine	UCU UCC UCA UCG	Serine	UAU UAC	Tyrosine	UGU UGC	Cysteine	U
									C
	UUA UUG	Leucine			UAA UAG	STOP	UGA	STOP	A
							UGG	Tryptophan	G
C	CUU CUC CUA CUG	Leucine	CCU CCC CCA CCG	Proline	CAU CAC	Histidine	CGU CGC CGA CGG	Arginine	U
									C
					CAA CAG	Glutamine			A
									G
A	AUU AUC AUA	Isoleucine	ACU ACC ACA ACG	Threonine	AAU AAC	Asparagine	AGU AGC	Serine	U
									C
					AAA AAG	Lysine	AGA AGG	Arginine	A
	AUG	Methionine START							G
G	GUU GUC GUA GUG	Valine	GCU GCC GCA GCG	Alanine	GAU GAC	Aspartate	GGU GGC GGA GGG	Glycine	U
									C
					GAA GAG	Glutamate			A
									G

Use the chart and formulas as needed

Hemophilia is an X-linked recessive trait characterized by the inability to properly form blood clots. It is often called the “Royal Disease” because it suddenly cropped up in the children of Great Britain ’s Queen Victoria (1819 – 1901). Alexis, the son of Tsar Nicholas II and Tsarina Alexandra of Russia and great grandson of Queen Victoria, was born with hemophilia. Neither of Alexis’ parents had hemophilia.

source Moose calf

The life of a moose begins with a single fertilized egg cell (called a zygote) containing 70 chromosomes. A mature moose is made up of an estimated 500 trillion cells.

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Bird flu is a growing concern for health organizations world-wide. It is primarily confined to Asian countries at this time. The disease causing agent (a virus) is easily transmitted from bird to bird; it can also be transmitted from bird to human, but with much lower likelihood. At this time the virus cannot be transmitted from human to human. People have succumbed to the disease only when they have had prolonged direct contact with infected birds, a more common occurrence when large bird and human populations live in close proximity.

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