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7.1 Chromosomes and Phenotype KEY CONCEPT The chromosomes on which genes are located can affect the expression of ________. 7.1 Chromosomes and Phenotype Two copies of each autosomal gene affect p__________. • Mendel studied autosomal gene traits, like hair texture. 7.1 Chromosomes and Phenotype • Mendel’s rules of inheritance apply to autosomal genetic disorders. – A heterozygote for a recessive disorder is a c______. – Disorders caused by dominant alleles are u________. (dominant) 7.1 Chromosomes and Phenotype Males and females can differ in sex-linked traits. • Genes on ____ chromosomes are called sex-linked genes. – Y chromosome genes in mammals are responsible for male characteristics. – X chromosome genes in mammals affect many traits. 7.1 Chromosomes and Phenotype • Male mammals have an XY genotype. – All of a male’s sexlinked genes are e_________. – Males have no second copies of sex-linked genes. 7.1 Chromosomes and Phenotype • Female mammals have an XX genotype. – Expression of sex-linked genes is similar to autosomal genes in females. – X chromosome i____________ randomly “turns off” one X chromosome.