CHROMOSOMES L13 Flashcards
I. Chromosomal Theory of Inheritance - SEQ Morgan's experiments II. Inheritance Patterns on Sex Chromosomes - CC, HD sex linkage III. Violations of Independent Assortment - SEQ, HD patterns of inheritance
1
Q
chromosome theory of inheritance
A
- genes have specific loci on chromosomes
- chromosomes undergo segregation and independent assortment
2
Q
wild type
A
- most common phenotype for a character in natural populations
3
Q
sex chromosomes
A
- 1 pair
- sex determining genes
- heteromorphic
- act homologous during meiosis
- contain genes unrelated to sex determination
4
Q
sex linked genes
A
- gene on either sex chromosome
5
Q
x inactivation
A
- genes on X chromosome expressed in females and males
6
Q
linked genes
A
- genes on same chromosomes
- many genes on each chromosome
7
Q
linkage
A
- tendency for groups of genes on same chromosome to be inherited together
- chromosomes inherited as units
- genes B and C not independent - violates law of independent assortment
8
Q
unlinked genes
A
- A and B on non homologous chromosomes – assort independently
9
Q
complete linkage
A
- 2 genes close together on same chromosome, inherited as a single unit
- no crossing over between them - no new combinations
- B and C on same chromosome – do not assort independently
10
Q
incomplete linkage
A
- genes on same chromosome, but not completely linked
- new combinations via crossing over
