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Unit 7 Vocabulary Review
Terms in this set (43)
A genotype with two different size letters. Ex. Bb
A genotype with two of the same size letters. Ex. gg, GG
A version of a gene represented by a letter. There are two of these in each genotype.
The two letters that represent the genes of one parent. We need two of these to make a Punnett square.
The trait or words explaining what a genotype means. Ex. Short pea plant
The stronger version of a gene that will appear if it is present.
The weaker version of a gene that will go into hiding if the dominant gene is present.
another term for heterozygous
another term for homozygous (AA, aa)
two copies of the dominant allele (AA)
two copies of the recessive allele (aa)
cases in which one allele is not completely dominant over another
ex. red pink white flowers
phenotypes produced by both alleles are clearly expressed
ex. black feathers are codominant for white feathers producing speckled pattern
occurs when a gene for a trait is found on X or Y chromosomes, ex hemophilia and colorblindness
normal female gametes
normal male gametes
-traits controlled by two or more genes
-a wide range of phenotypes
ex. human height and pigmentation, eye color, hair color
three or more forms of a gene that code for a single trait
Type A genotypes
IAIA or IAi
Type O genotype
Type B genotype
IBIB or IBi
Type AB genotype
A __________________ is a family tree used to look at the inheritance of certain traits, especially of genetic diseases
What does the symbol represent?
What does the symbol represent?
In dominant genetic disorders, those who do not have the disorder are homozygous _________ (aa) for the trait
Is the pedigree autosomal dominant or recessive?
What type of pedigree is this?
sex linked recessive
Which words best describe the pedigree? autosomal, sex linked, recessive, dominant
inherited on a single gene on a chromsosome
inherited due to problems with an entire chromosome
A human genetic disease caused by a dominant allele; characterized by uncontrollable body movements and degeneration of the nervous system; usually fatal 10 to 20 years after the onset of symptoms.
sickle cell anemia
a genetic disorder that causes abnormal hemoglobin, resulting in some red blood cells assuming an abnormal sickle shape. This is a codominant disorder.
Sickle cell is an example of
A genetic disorder that occurs in people with two copies of a certain recessive allele; characterized by an excessive secretion of mucus and consequent vulnerability to infection; fatal if untreated.
A human genetic disease caused by a recessive allele that leads to the accumulation of certain lipids in the brain. Seizures, blindness, and degeneration of motor and mental performance usually become manifest a few months after birth. Predominantly in Jewish populations
a disorder related to a defective recessive gene that prevents metabolism of phenylalanine, tested for at birth, can be controlled by diet
An X-linked recessive disorder in which blood fails to clot properly, leading to excessive bleeding if injured.
red-green color blindness
sex-linked recessive, affects mostly males but also homozygous females.
Error in meiosis in which homologous chromosomes fail to separate.
Down's Syndrome (Trisomy 21)
the presence of an extra number 21 chromosome in the genome. Causes mental retardation and distinctive physical characteristics.
Turner's Syndrome (XO)
short, sterile. caused by nondisjunction, loss of an X chromosome early in embryonic development, deletion of part of one X chromosome
A chromosomal disorder in which males have an extra X chromosome, making them XXY instead of XY.
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