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Glossary of Genetics Review

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Who is the father of genetics?
Gregor Mendel
An trait that is hidden and does not show in an individual. This trait can be passed onto their children.
A recessive trait.
Both alleles are the same.
Homozygous
The alleles are different.
Heterozygous
How many alleles are there for blood type and what are they?
There are three alleles: A,B,O
A range of hair color in our population indicates this type of inheritance.
Polygenic inheritance
A chart used to follow a genetic trait from generation to generation.
Pedigree
Hemophilia and colorblindness are examples of this kind of genetic disorder.
Sex-linked disorder. The defective gene is located on the X chromosome.
Why do males have a greater chance of having a sex-linked disorder than females?
Because the gene is on the X chromosome and males only have one X chromosome.
In pea plants, short is the recessive allele. What is the probability that two heterozygous(Tt)pea plants will have offspring that are also heterozygous?
50%
Four o'clock flowers have two alleles for flower color, red and white. Why is it that there are 3 colors of four o'clock flowers?
When both the red and white allele are inherited, both of the alleles are expressed, resulting in a third color, pink.Incomplete dominance.
The genes an organism has for a given trait.
Genotype
The physical expression of the genes for a trait.
Phenotype
Which blood type allele is always recessive?
O
A disease where the red blood cells are misshapen.
Sickle cell anemia
True or False. A recessive genetic disorder can only be inherited if both alleles are recessive
True
The disease when the blood does not clot properly. Sometimes called the bleeder's disease.
Hemophilia

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