LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

DIVERSITY AMONG LIFE FORMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
a form of a gene that is expressed only when a dominant allele is not present
A
recessive
B
dominant
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -In hetrozygous condition, the recessive allele is not expressed due to the presence of dominant allele.

Detailed explanation-2: -A recessive allele will only be expressed as a phenotype when there is no dominant allele.

Detailed explanation-3: -Codominance occurs when the alleles do not show any dominant and recessive allele relationship. However, each allele from homozygote is able to add phenotypic expressions in the offspring or simply the “mix” of each allele.

Detailed explanation-4: -Recessive alleles only express their phenotype if an organism carries two identical copies of the recessive allele, meaning it is homozygous for the recessive allele. This means that the genotype of an organism with a dominant phenotype may be either homozygous or heterozygous for the dominant allele.

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