An allele that completely masks the effect of another allele is considered
A) codominant.
B) dominant.
C) ineffective.
D) recessive.
B
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Describe three characteristics of an ideal cloning host for genetic engineering
What will be an ideal response?
Which molecules are made during glycolysis?
A) NADH and ATP B) ADP and NADPH C) water and NAD+ D) oxygen and water
Cross-mating may occur between two different species but the resulting offspring survive poorly and are sterile. Why is this particularly important to endangered species that cross-mate?
a. This can lead to extinction of particular species. b. The resulting hybrids are the basis for a new species. c. Hybrids increase the reproductive capacity of the endangered species. d. This will lead to genetic divergence in the population. e. This can lead to an increase in numbers of the endangered species.
In humans, the genetic basis for determining the sex "male" is accomplished by the presence of ________
A) high levels of estrogen B) a balance between the number of X chromosomes and the number of haploid C) a portion of the Y chromosome D) multiple alleles scattered throughout the autosomes E) one X chromosome F) sets of autosomes