Biology Questions and Answers
- What are the situations in
which the environment can
alter the genotype of an
individual? What is the
condition for this type of
change to be transmitted to
the offspring?
The environment can only alter
genotypes walterations in the genetic materialhen its action causes (^)
(mutations) of the individual, i.e.,
deletion, adentire chromosomdition oes or of nucleotidr substitution of (^) es
that form the DNA molecules.
Mutationsoffspring when affecting are only transmitted the germ cellsto the (^)
that produce gthemselves. ametes or the gametes
- What are some examples
of phenotypical characteristics
that present two or more
varieties and of phenotypical
features that do not vary? In
relation to the genes
correspondent to those
characteristics that vary
among individuals what can
be expected about their
alleles?
Color of the eyes, color of the hair, color
of the skin, hexamples of phenotypical feight, blood type areatures te (^) hat
present two or more varieties. Other
examples arseeds in some e the color plants, thof flowers ae sex of thend
individual in dioecius species, etc.
Examples of phenotypical characteristics
that do not present variation among
individuals ogeneral the number of limbs, thef the same species ar e: in
anatomical position of the organs, the
general coetc. nstitution of tissues and cells,
Phenotype possibilitynatural variations (in beings of the same of presenting (^)
species) are necessarily determined by
two or more different alleles ocorrespondent gene. These differentf the (^)
alleles combine and form different
genotypes tphenotypes (variations).hat condition the different
- Considering a pair of
homologous chromosomes
containing a gene having two
different alleles how many
different genotypes can the
individual present?
If a gene of a diploid species has
different alleles, fthe possible genotypes aror example, e: A’A’, AA,A and A’,
and AA’. So any of these three different
genotypes may individual. be the genotype of an - For an individual having a
genotype formed of two
different alleles that condition
different varieties of the same
phenotypical trait, upon what
will the phenotypical feature
actually manifested depend?
If an individual different alleles (commopresents a gn situation), fene havingor (^)
http://www.biology-questions-and-answers.com