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7. Genetics

DDMS 7th Grade - Chap. 15, sec. 1 & 2

The chromosomes that carry genes to determine whether a person will be male for female, as well as genes for other traits Sex Chromosomes
A gene that is carried on the X or the Y Chromosome Sex-linked gene
A person who carries a recessive gene for a trait, but does not show the trait Carrier
When two different alleles are present, and both traits occur together Codominance
If you have an allele for type A blood, and an allele for type o blood, what blood type will you have? Type A
If you have an allele for type B blood, and an allele for type A blood, what blood type will you have? Type AB
Who is more likely to have a sex-linked trait? Males
If a male has a sex-linked trait, which parent did he get that trait from? His Mother
Can a male be a carrier for a sex linked trait? Why? No; if a male has even one recessive allele, he will have the trait.
Why can a sex-linked traits sometimes occur if a person has only one recessive allele? If there is no dominant allele with it, the trait will occur
What else, other than genetics, can determine a person’s characteristics? The environment that someone lives in can determine how certain characteristics develop
An abnormal characteristic that a person inherits through genes or chromosomes Genetic Disorder
A chart that tracks which family members have a particular trait Pedigree
When two different alleles are present, the result is a blend of the two traits. Incomplete Dominance
Created by: jfakins



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