Contemporary Issues in Biology Sawey TCU Exam 2 Questions & 100% Verified Answers | Latest Update | Already Graded A+

chromosomal abnormalities ☑: -caused by problems with meiosis -gametes have abnormal numbers of chromosomes -offspring inherit extra chromosome or a missing chromosome chromosomal ☑: down syndrome is an example of a __________ gene disorder amniocentesis ☑: -used on pregnant women over 35 years of age -performed during weeks 15-17 of pregnancy -a needle is inserted into the amniotic sac -amniotic fluid with fetal cells is removed -a karyotype of the fetal chromosomes is prepared higher ☑: before age 45, the risk of having a miscarriage due to amniocentesis is _______ than the risk of having a baby with down syndrome EXCELLENCE 2 lower ☑: after the age 45, the risk of having a miscarriage dude to amniocentesis is _____ than the risk of having a baby with down syndrome single gene disorders ☑: correct number of chromosomes, but one of the chromosomes contains a gene that is responsible for the disease single ☑: cystic fibrosis is an example of a ________ gene disorder cystic fibrosis ☑: mucus in bronchi is thick, interfering with lung function genotype ☑: refers to alleles phenotype ☑: refers to appearance down syndrome EXCELLENCE 3 ☑: occurs when 21st chromosome pairs don't separate properly during meiosischild gets 3 chromosomes of 21st pair single ☑: hemophilia is an example of a _____ gene disorder hemophilia ☑: -person lacks the blood proteins for clotting -caused by a sex-linked recessive allel