Match Each Term with Its Definition

question 30

Multiple Choice

Match each term with its definition.
-chorionic villi

• A)undifferentiated muscle cells
• B)pigmented layer of cytoplasm opposite from point of entry of sperm
• C)rounded layer of cells at the surface of yolk in birds
• D)solid rod of tissue that is involved in neurulation
• E)fingerlike extensions into the endometrium
• F)clear fibrous protein
• G)programmed cell death
• H)event when a group of cells influences a nearby group of cells

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Definitions:

Additive Alleles

Alleles that contribute to the phenotype in an additive manner, where the effect of multiple alleles simply adds up.

Dominant Alleles

Alleles that express their phenotype even when paired with a different allele in a heterozygous genotype.

Recessive Alleles

Genetic variants that must be inherited from both parents to be expressed in the offspring; not expressed when a dominant allele is present.

Genetic Drift

Genetic drift refers to random fluctuations in the frequencies of alleles (variant forms of a gene) within a population, which can lead to the increase or decrease in certain traits over time.