Biology Questions and Answers
example, A and A’, three types of
genotypes may AA’. The question be formed: AA, A’Arefers to an individual’ and (^)
bearing a genotype made of two
different alleles, so it is thgenotype (the heterozygous individual).e AA’
This AA’ individual phenotype conditionmay manifest theed by the allele A or (^)
the phenotype conditioned by the allele
A’ or still a mixetwo forms. If the alleld phenotype of thosee A is dominant
over the allele A’ the form conditioned
by A will manifallele, the form determinest. If A’ is the dominanted by A’ will
manifest. This pdominance and occurs bhenomenon is kecause nown asthe
recessive (nondominant) allele
manifestsin the genotype (in homozyg only when present in doubleosity),
while the dominant allele manifests
even when in heterozygosity.the alleles dominate a mixture of the If none of
two varieties conditioned by both alleles
appears or instead a thircome out. d form may
- What is the difference
between dominant allele and
recessive allele?
Dominant alleldetermines phenotypical fee is the allele thatatures that (^)
manifest in hheterozygous genotypes.omozygous or
In Genetics the dominant allelrepresented in uppercase, e.g., “A”,e is (^) and
its recessive allele is written in
lowercase, “a”.
In molecular terms generally the
recessive allele sequence previously idhas a nenticalucleotid to thee (^)
corresponding sequence in the dominant
allele but that duinactivated by mutation.ring evolution was This fact
explains the expression of the dominant
phenotype in heterozygosity (since onefunctional allele is still present).
- Whenever a pair of alleles
has different alleles is there
dominance between them?
Not in different alleles is thall cases of a gene having twoe dominance
complete. Theterozygosity occurs with incomhere are genes in whichplete (^)
dominance (manifestation of an
intermediate phthe homozygous, like enotype in relation toin the color of
roses, between white and red) and
other genes that p(expression of a third different feature,resent codominance (^)
as in the MN blood group system).
- What is the difference
between homozygosity and
heterozygosity?
Homozyhas two identicalgosity occurs w alleles of a gene, forhen an individual
example, occurs when an individAA or aa. Heterozygual has twoosity
different alleles oexample, Aa. f the same gene, in the
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