RT Book, Section
A1 Pyeritz, Reed E.
A2 Papadakis, Maxine A.
A2 McPhee, Stephen J.
A2 Rabow, Michael W.
SR Print(0)
ID 1166177593
T1 Genes in Families
T2 Current Medical Diagnosis and Treatment 2020
YR 2020
FD 2020
PB McGraw-Hill Education
PP New York, NY
SN 9781260455281
LK accessmedicine.mhmedical.com/content.aspx?aid=1166177593
RD 2022/05/16
AB Since  the  first  decade  of  the  twentieth  century,  the  patterns  of  recurrence  of  specific  human  phenotypes  have  been  explained  in  terms  of  principles  first  described  by  Mendel  in  the  garden  pea  plant.  Mendel's  second  principle—usually  referred  to  as  his  first1—is  called  the  law  of  segregation  and  states  that  a  pair  of  factors  (alleles)  that  determines  some  trait  separates  (segregates)  during  formation  of  gametes.  In  simple  terms,  a  heterozygous  (A/a)  person  will  produce  two  types  of  gametes  with  respect  to  this  locus—one  containing  only  A  and  one  containing  only  a,  in  equal  proportions.  Offspring  of  this  person  will  have  a  50–50  chance  of  inheriting  the  A  allele  and  a  similar  chance  of  inheriting  the  a  allele.