Biology Questions and Answers
The Mendel’s first law is also known as
the law odeduced the way gf purity of enes and alleles weregametes. Mendel (^)
transmitted and traits were conditioned
without even knowing of the existencof these elements. e
- Which is the type of gamete
(for a given trait) produced by
a dominant homozygous
individual? What is the
genotypical proportion of
these gametes? What about a
recessive homozygous
individual?
If an individual homozygous, for example, AA, itis dominant (^) will
produce oA. The proportion thnly gametes hus is 100% of AAaving the allele
gametes.
If an individual homozygous, for example, aa, it willis recessive (^)
produce oa, also in a 100% proportion.nly gametes having the allele
- Which is the type of
gamete produced by a
heterozygous individual?
What is the genotypical
proportion of these gametes?
Heterozygous individuals, for example,
AA, produce two gametes: one containindifferent typg the allele es of (^) A
and another type containing the allele a.
The proportion is 1:1.
- In the F2 generation of a
hybridization for a given trait
conditioned by a pair of alleles
T and t, according to Mendel’s
first law what are the
genotypes of each
phenotypical form? How many
respectively are the
genotypical and phenotypical
forms?
In the mentiogenotypical forms in ned hybridization F2 will be TT, ttthe (^)
and Tt. Therefore there will be three
different genotypical fdifferent phenotypical formsorms and two
(considering T dominant over t).
- Why can the crossing of an
individual that manifests
dominant phenotype with
another that manifests
recessive phenotype (for the
same trait) determine
whether the dominant
individual is homozygous or
heterozygous?
From the crossing ofhaving recessive phenotype with an individual
another the same having dominant ptrait) it is possible tohenotype (for
determine whether the dominant
individual heterozygous. This is truis homozygous ore because (^) the
genotype of the recessive individual is
obligatorily hoaa. If the other individual is alsomozygous, for example,
homozygous, AA, the F1 offspring will
be only heterozygous (aa x AA = Aa). If the other individual is only
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