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Pts 1 dif m ref 506 key remembering 22 ans a the

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PTS:1DIF:MREF:506KEY: REMEMBERING22.ANS: AThe location of a specific gene on a chromosome is called alocus,and the locus of each gene does not varyfrom one person to another. This allows the genes supplied by the egg to align with similar genes supplied bythe sperm. The locus of a gene does not influence whether a mutation occurs. It also does not affect whetherfertilization occurs. Gender is determined by sex chromosomes.PTS:1DIF:MREF:507KEY: UNDERSTANDING23.ANS: CA dominant allele overshadows the effect of a recessive allele, so it will be expressed even if only onechromosome in a pair carries it.PTS:1DIF:EREF:507KEY: REMEMBERING24.ANS: ABecause the alleles are different, the individual will be heterozygous for the trait. Also, because brown eyesare a dominant trait, that trait will overshadow the recessive blue eye trait. A person is homozygous for a traitwhen both alleles are the same.PTS:1DIF:MREF:507KEY: APPLYING25.ANS: CSex-linked disorders are recessive and are carried on the X chromosome. Because the X chromosome is somuch larger than the Y chromosome, a male does not have a matching dominant allele to overpower the X-linked recessive trait. Therefore, he would express the disorder. In contrast, a female, who would have amatching dominant allele, would only be a carrier of the trait. (It’s possible, however, for a female to expressthe disorder if she carries a matching recessive allele on her other chromosome, but this is rare.) Turnersyndrome results from nondisjunction of sex chromosomes.PTS:1DIF:DREF:508KEY: UNDERSTANDING26.ANS: BTwo copies of the defective allele must be inherited for the disorder to manifest itself; therefore, with only oneallele, children can carry the disorder and pass it along to their children, but they will not personally manifestthe disorder.PTS:1DIF:MREF:509KEY: UNDERSTANDING27.ANS: CCopyright © 2020 F. A. Davis Company
Because each child receives one copy of the gene from the mother and one from the father, he or she has a 50percent chance of inheriting the defective gene and manifesting the disorder.PTS:1DIF:MREF:509KEY: APPLYING28.ANS: DMultifactorial disorders result from many contributing factors, including multiple genes in combination withlifestyle and environmental factors. None of the other answers is correct.PTS:1DIF:EREF:511KEY: REMEMBERINGCopyright © 2020 F. A. Davis Company
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Term
Fall
Professor
Edwards
Tags
Genetics, Zygosity, Sex linkage

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