A number of plant species have a recessive allele for
albinism; homozygous albino (white) individuals are unable
to synthesize chlorophyll. If a tobacco plant heterozygous
for albinism is allowed to self-pollinate and 500 seeds
germinate: a)how many offspring will be the same genotype
as the parent? b)how many seedlings would you expect to be
In hogs a gene that produces a white belt around the
animal's body is dominant over its allele for a uniform
body. Another independent dominant gene produces fusion of
the hoof (syndactyly). Suppose a uniformly colored hog
homozygous for syndactyly is mated with a normal footed hog
homozygous for the belted character. What would be the
phenotype of the F1? If the F1's interbreed, what would be
the phenotypic ratio of the F2?
The ABO blood system has been employed to settle cases of
disputed paternity. Suppose, as an expert in genetics, you
are called to testify in a case where the mother is type A,
the child is type O and the alleged father is type B. How
would you respond to the following statements of the
a. "Since the mother has type A, the type O of the child
must have come from the father and since my client is type
B, he obviously could not have fatered the child." Made by
the attorney of the alleged father.
b. "Further tests revealed that this man is heterozygous
and therefore he must be the father." Made by the mother's
In cucumbers normal leaves (N) are dominant to curled
leaves (n) and elongated fruit (L) is dominant to spherical
fruit and these genes are linked on the same chromosome. If
a pure-breeding normal-leaved, elongated fruit cucumber is
crossed with a curled-leaved, spherical fruit cucumber,
what will be the phenotype of the F1? the phenotypic ratio
of the F2?
what is DIY Gene testing ?
What are the benefits/risks when company traditional and
genetically engineered breeding?
How to construct Genetic Code?
What are the 8 steps that are involved in genetic
What is your personal opinion regarding genetic engineering
and human cloning?
How can all organisms share the same 4 bases DNA and still
be so diverse?