Mosaicism Study guides, Class notes & Summaries

TTU Biology 1402 Exam 2- Dr. Held Latest Update Already Passed Karyotyping (#chromosome) -To determine if the patient has an abnormal # of chromosomes - "A photographic inventory of an individual's chromosomes." - ordered display of chromosomes, doubled. Criss- Cross Inheritance Sons inherit their X chromosome from their mother Codominance -The heterozygote expresses both traits (alleles). -"A" and "B" genes make structures (not enzymes)= sugar types. -Ex) Blood types (A,B, ...

Under what circumstances should an infant with clinical features of Down syndrome be karyotyped? A. Only if the parents desire more children B. Only if the mother is younger than 35 years old C. Only if not all of the features of Down syndrome are present D. Only if the mother has had 3 early miscarriages E. Always - Answer-E. Always What is the parental origin and stage of meiosis when most meiotic errors occur resulting in chromosomal trisomy? A. Maternal meiosis I B. Paternal...

A mutation that does not cause a disease but that is unstable at mitosis and meiosis and can change into a pathogenic mutation. a post-zygotic (somatic) mutation a missense mutation a dynamic mutation a premutation correct answers a premutation A pathogenic mutation that is unstable at mitosis and meiosis and can result in progressively severe phenotypes. a post-zygotic (somatic) mutation a missense mutation a dynamic mutation a premutation correct answers a dynamic ...

Under what circumstances should an infant with clinical features of Down syndrome be karyotyped? A. Only if the parents desire more children B. Only if the mother is younger than 35 years old C. Only if not all of the features of Down syndrome are present D. Only if the mother has had 3 early miscarriages E. Always - E. Always What is the parental origin and stage of meiosis when most meiotic errors occur resulting in chromosomal trisomy? A. Maternal meiosis I B. Paternal meiosis I C. ...

D correct answers A mutation that does not cause disease but that is unstable at mitosis and meiosis and can change into a pathogenic mutation A. a post-zygotic (somatic) mutation B. a missense mutation C. a dynamic mutation D. a premutation C correct answers A pathogenic mutation that is unstable at mitosis and meiosis and can result in progressively severe phenotypes A. a post-zygotic (somatic) mutation B. a missense mutation C. a dynamic mutation D. a premutation A correct a...

Under what circumstances should an infant with clinical features of Down syndrome be karyotyped? A. Only if the parents desire more children B. Only if the mother is younger than 35 years old C. Only if not all of the features of Down syndrome are present D. Only if the mother has had 3 early miscarriages E. Always - E. Always What is the parental origin and stage of meiosis when most meiotic errors occur resulting in chromosomal trisomy? A. Maternal meiosis I B. Paternal meiosis I C. ...

A 13yearold girl comes to the genetics clinic because of frequent nosebleeds. When taking the family history, which of the following is the MOST important for the genetic counselor to elicit? A. gastrointestinal bleeds B. varicose veins C. hearing loss D. renal carcinoma correct answers A. gastrointestinal bleeds A woman who was evaluated and diagnosed with facioscapulohumeral (FSH) muscular dystrophy 10 years ago calls to request general information to share with her new husband and his...

Under what circumstances should an infant with clinical features of Down syndrome be karyotyped? A. Only if the parents desire more children B. Only if the mother is younger than 35 years old C. Only if not all of the features of Down syndrome are present D. Only if the mother has had 3 early miscarriages E. Always correct answers E. Always What is the parental origin and stage of meiosis when most meiotic errors occur resulting in chromosomal trisomy? A. Maternal meiosis I B. P...

A mutation that does not cause a disease but that is unstable at mitosis and meiosis and can change into a pathogenic mutation. post-zygotic (somatic) mutation missense mutation dynamic mutation premutation correct answers premutation A pathogenic mutation that is unstable at mitosis and meisis result in progressively severe phenotypes becayse oligonucleotides repeat in length and can increase from one generation to the next. post-zygotic (somatic) mutation missense mutation dynami...

Under what circumstances should an infant with clinical features of Down syndrome be karyotyped? A. Only if the parents desire more children B. Only if the mother is younger than 35 years old C. Only if not all of the features of Down syndrome are present D. Only if the mother has had 3 early miscarriages E. Always correct answers E. Always What is the parental origin and stage of meiosis when most meiotic errors occur resulting in chromosomal trisomy? A. Maternal meiosis I B. P...