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Franz Boas found that one of the major physical differences between first-generation immigrants to the United States and their children was in the area of:
Chromosomes 21
One of the 23 pairs of chromosomes in humans; an abnormality in the number of chromosome 21 leads to Down syndrome.
Genetic Disorder
A disease or condition caused by an abnormality in an individual's DNA, ranging from small mutations to large chromosomal changes.
Codominance
A genetic scenario where two alleles of a gene pair in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.
ABO Blood Group
A classification system for human blood based on the presence or absence of antibodies and inherited antigenic substances on the surface of red blood cells.
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