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A testcross is
A mating between and individual of unknown genotype and an individual homozygous recessive for the trait of interest
A chart that shows the relationships among parents and children over more than one generation and is used for genetic analysis is called
Research since Mendel's time has established that the law of the segregation of genes during gamete formation
Applies to all sexually reproducing organisms
When both alleles are expressed in individuals (such as chickens with black and white feathers or ABO blood types) this is called
Dr. Smith's parents have normal hearing. However, Dr. Smith has an inherited form of deafness. Deafness is a recessive trait that is associated with the abnormal allele d. The normal allele at this locus, associated with normal hearing, is D. Dr. Smith's parents could have which of the following genotypes?
Dd and Dd
Mendel's law of independent assortment states that
Each pair of alleles segregates independently of the other pairs of alleles during gamete formation
A carrier of a genetic disorder who does not show symptoms is most likely to be
Heterozygous for the trait and able to transmit it to offspring
When there are 2 dominant alleles but neither is fully expressed (such as the color in snap dragons-red, white, and pink) this is called
Amniocentesis and chorionic villus sampling allow for _____ and _____ of the fetus so that it can be tested for abnormalities
Why are sex-linked diseases more common in men than in women
Men need inherit only one copy of the recessive allele on the X chromosome for the disease to be expressed
The vast majority of people afflicted with recessive disorders are born to parents who were
Not affected at all by the disease
A ______ involves a change in a single base whereas a ______ involves a segment of a chromosome, a whole chromosome, or a set of chromosomes
Point mutation...chromosomal mutation
When the trait displayed is controlled by one or more genes (such as eye color, hair color, skin color) this is called
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