BIOL 2153 Chapter : Chapter 3 Review Exam 2
Document Summary
#1: orientation of homologous pairs of chromosomes during metaphase i is random. #3: fusion of different gametes at fertilization: the genetic variability that occurs from one generation to the next results almost entirely from meiosis and sexual reproduction in 3 areas. Genetics exam 2: random alignment of chromosome during metaphase i, crossing over during prophase i, random combination of gametes at fertilization, gametogensis. X- linkage: in x-linked recessive inheritance, females homozygoous for the recessive allele or males hemizygous for it display the recessive phenotype, in x-linked dominant traits, heterozygous females and males hemizygous for the dominant allele express the dominant phenotype. Sex determination: sex determination involves the genetic and biological processes that produce the male and female characteristics of a species, placental mammals have x and y chromosomes. Genetics exam 2: sex determination depends on the +/- of a single gene, sry, found on the y chromosome, in mammals, males can be xy (normal), xxy, or xyy; females are.
