BIO202 Exam3 #21-30

Autosomal Recessive

A trait like albinism that only appears in the phenotype if an individual is homozygous recessive (aa)

Test Cross

Crossing an unknown dominant phenotype with a homozygous recessive individual to reveal the unknown's genotype

Chiasmata

The X-shaped regions where crossing over occurred that hold homologous chromosomes together during Meiosis I

Cohesin Cleavage

The proteolytic action by separase that allows sister chromatids to separate during anaphase

Kinase Activation

The result of a cyclin binding to a Cdk which enables the phosphorylation of target proteins

Semiconservative Model

The DNA replication mechanism where each daughter molecule has one old parental strand and one new strand

Chromatin

The complex of DNA and proteins (histones) that makes up eukaryotic chromosomes

Metaphase Plate

The imaginary plane where chromosomes align; individual alignment indicates mitosis

Kinetochore

The protein structure on the centromere that acts as an attachment point for spindle microtubules