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Chapter 5 Worksheets
Terms in this set (21)
How are inbreeding and hybridization different?
Inbreeding is breeding parents with similar traits. Hybridization is breeding parents with genetically different traits to try to get the best of both parents.
What is cloning?
Cloning is making a new organism with the exact same genetic make up of the parent organism.
How are bacteria used in genetic engineering?
Bacteria are using in genetic engineering because they have a cell with a single DNA and they reproduce quickly. The desired trait is inserted in the DNA of the bacteria and then inserted into the plant or animal to get the desired trait.
How could gene therapy someday be used to treat genetic disorders?
The damaged part of the DNA could be replaced with a normal DNA part to eliminate the genetic mutation.
What is the Human Genome Project?
An initiative to find every single DNA sequence on all of the human DNA.
Is color blindness a recessive or dominant gene?
How does a person with one sickle-cell allele differ from a person with two sickle-cell alleles?
The person with only one sickle-cell allele will not show symptoms of the disease. They are a carrier. The person with two sickle-cell alleles will show the symptoms of the disease.
Why is hemophilia more common in males than in females?
The gene for hemophilia is on the X chromosomes. Boys are XX and girls are XY so boys have twice as much chance at having hemophilia than girls.
Explain what causes Downs Syndrome.
A person with Downs Syndrome has one extra copy of chromosome 21. ( the chromosomes failed to divided properly)
Give an example of a human trait that is controlled by a single gene with multiple alleles.
Is hemophilia a sex-linked disorder?
Yes, the allele for hemophilia is recessive and carried on the X chromosome.
What could be used to diagnose Down Syndrome?
How does genetic engineering help people who have diabetes?
People with diabetes do not produce enough insulin. The human gene that produces insulin is inserted into a bacterial plasmid. The bacteria reproduces quickly and all of the resulting bacteria will have the gene for insulin.
A male has _______ X chromosomes.
A female has ______ X chromosomes.
Why do humans have a wide variety of phenotypes for skin color?
The trait for skin color is controlled by 3 or more genes working together. There are many different combinations of alleles that result in many different skin colors.
Why are traits controlled by recessive alleles on the X chromosome more common in males than in females?
Females have 2 X chromosomes, while males only have 1. In females the dominant allele will mask the recessive trait, but in males what you see is what you get. Even a recessive allele will produce the trait in males.min
How do geneticists use a pedigree?
Geneticists use pedigrees to trace the occurrence of a genetic disorder.
A woman with normal color vision has a colorblind daughter. What are the genotypes and phenotypes of the parents.
The mother has to be a carrier of the color blindness allele. The father must be color blind so that the daughter receives two x chromosomes both with the recessive allele.
Describe 2 ways in which people with genetic disorders can be helped.
Physical Therapy can be used to help remove mucus from the lungs of people with cystic fibrosis.
People with Down Syndrome receive special education and job training to find work.
What are the 2 major causes of genetic disorders in humans?
1. mutations in the DNA
2. changes in the overall structure or number of chromosomes
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