A ________ Gene Is a Permanently Altered Segment of DNA

question 62

Multiple Choice

A ________ gene is a permanently altered segment of DNA that can give rise to genetic variability.

• A)recessive
• B)dependent
• C)mutated
• D)dominant

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Definitions:

Trophoblast

A layer of cells forming the outer shell of a blastocyst, providing nutrients to the embryo and developing into a large part of the placenta.

Extraembryonic Membranes

Membranes that develop outside of the embryo in amniotes, providing protection, nutrition, gas exchange, and waste elimination.

Synapsis

The pairing of two homologous chromosomes that occurs during meiosis, allowing for genetic recombination.

Primary Germ Layers

The three initial layers of cells (ectoderm, mesoderm, and endoderm) in the early embryo from which all bodily tissues and organs develop.