In this lesson our instructor talks about sex-linked traits and pedigree analysis. First she talks about sex-linked traits, X-inactivation and barr bodies. Then she discusses pedigrees, autosomal dominant inheritance, autosomal recessive inheritance, and X-linked recessive inheritance. Four complete example videos round up this lesson.
have 23 pairs of autosomes and one pair of sex chromosomes. Males
are XY and females are XX. Genes that are located on the sex
chromosomes are called sex-linked genes.
In females, one copy of the X-chromosome
is inactivated in each cell. The inactivated copy of the X
chromosome is called a Barr body.
A pedigree is a diagram of a family tree
that indicates the phenotype of individuals for a particular trait.
Pedigree analysis can help to determine the inheritance pattern of a
trait or genetic disorder.
Pedigrees for traits with an autosomal
dominant inheritance pattern show an approximately equal number of
affected males and females. Autosomal dominant traits do not skip
a trait is inherited in an autosomal recessive pattern, males and
females are approximately equally affected. The trait may skip a
are more frequently affected if a disorder has an X-linked
recessive inheritance pattern. Females may be carriers and these
disorders can skip a generation.
Sex-Linked Traits and Pedigree Analysis
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The book and CD package include three full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book has a great topic-by topic breakdown of the 14 must-know principles with sample questions and answers for each of the subjects. Laboratory Review includes a focused review of all 12 AP laboratory exercises. Included in this is 2 full length practice tests that stimulate the actual test along with answers and complete explanations.
This book includes a comprehensive biology test topic review, covering everything from photosynthesis to genetics to evolution. Cracking the AP Biology also includes testing strategies for the grid-in and essay section, great guidance on writing a high-scoring essay, and two full length practice exams with detailed explanations.