Genetics Review
Terms
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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