GENETICS By: Noor, Doris, Fhamida. JEOPARDY BOARD Crosses and Inheritance Sex-linked/...

GENETICS

By: Noor, Doris, Fhamida

JEOPARDY BOARDCrosses and Inheritance Sex-linked/ Pedigree Diseases

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FINAL JEOPARDY

The inheritance of skin color in a human is an example of which of the following?

1. Pleiotropy2. Codominance3. Epistasis4. Polygenic inheritance5. Gene linkage

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4.

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Red-headed people frequently have freckles. This is best explained by which of the following?

1. The genes for these two traits are linked on the same chromosome.

2. The genes for these two traits are sex-linked.3. Nondisjunction occurs frequently with chromosomes

bearing these traits.4. Alleles for these two traits are codominant.5. Both parents have red hair and freckles

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1.

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Which of the following statements is true?1. A dihybrid cross is a cross between individuals

heterozygous for one gene.2. The law of independent assortment describes the

relationship between alleles of a single gene.3. The law of segregation describes the manner in which

genes on different chromosomes segregate.4. Homologous chromosomes segregate into different

gametes.

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4.

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From which parent did a male with red-green color blindness inherit the defective allele?

1. only the mother2. only the father3. the mother or the father, but not both4. both the mother and the father

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1.

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What is the ratio when two different traits are crossed? What is this

cross called?

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9:3:3:1;Dihybrid Cross

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Excluding sex chromosomes, what are all other chromosomes

called?

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Autosomes

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What are heterozygous individuals who posses a

recessive allele for a genetic disorder but does not express that disorder

called?

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Carriers

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What is this pedigree an example of?

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autosomal dominant trait

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Keeping in mind that the allele for albinism is recessive, what are the chances that two heterozygotes will have a child with normal skin

pigment?

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¾ (75%)

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A father has type AB blood and the mother has type A blood, which blood types can their children

not have?

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Type O

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What is sickle cell anemia?

A recessive disorder most common among those of

African descent and is caused by substitution

of a single amino acid in hemoglobin. Deformed red

blood cells.

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What is Tay-Sachs disease?

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A genetic disorder in which non-functional enzyme fails to break

down lipids in Brain cells.

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What is Turner’s syndrome?

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A disorder in which there are 45 chromosome due to a missing chromosome.--- Characteristics: small stature female, sterile female, webbed skin

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Explain how red color blindness is inherited.

Why is it more common in males than females?

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Red color blindness is controlled by the recessive

allele in the x chromosome. For a female to be colorblind, she

must inherit two recessive alleles whereas a male only

need to inherit one recessive gene.

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Name and describe the 3 mendelian pattern of

inheritance.

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1)Autosomal Dominant-Dominant inheritance occurs when an abnormal gene from one parent causes disease even though the matching gene from the

other parent is normal. Autosomal Recessive-both matching genes must be

abnormal to cause disease.

2)Sex-linked Recessive-Sex-

linked diseases are passed down through families through one of the X or Y chromosomes.

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Topic: Random

FINAL

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If scientists wish to add a eukaryotic gene to a bacterium in order to get the bacterium to make the

eukaryotic protein, they usually produce the DNA for this gene by

a. copying the mRNA for the protein with reverse transcriptaseb. exposing the bacteria to mutagens and then selecting for those

that make the needed proteinc. isolating the correct eukaryotic gene and then removing the

introns from the DNAd. ligating the string of oligonucleotides isolated from eukaryotic

DNAe. sequencing the amino acids in the protein and then constructing

a piece of DNA to code for them

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A.

The scientists use mRNA because it does not have introns. They use reverse transcriptase to make complementary DNA or cDNA. The cDNA is then added to the plasmid and introduced to the bacteria.

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