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3.4 Inheritance
Ib Syllabus
6
Biology
12th Grade
03/02/2016

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Term
What type of cells are created from the fusion of two gametes?
Definition
one diploid zygote with two alleles of each gene.
Term
What is a dominant allele?
Definition
an allele whose characteristics are expressed in the homozygous state, and in the heterozygous state. If this allele is present, the trait will always be expressed.
Term
What is a recessive allele?
Definition
its characteristic is only expressed in the homozygous state, only with the absence of a dominant trait.
Term
What is codominance?
Definition
when both alleles are dominant so both are partially expressed in the phenotype of the offspring.
Term
Define sex-linkage of a disease.
Definition
he phenotype of an allele that is directly tied to the sex chromosomes.
Term
What are consequences of radiation after nuclear bombing or an accident?
Definition
Acute radiation syndrome. radiation for a short time but lots of radiation. nausea, vomiting, hair loss at high doses.
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