Genetics general 18
Who discovered the law of genetic equilibrium in populations:
Darwin and Wallace
Von Baer and Haeckel
Hardy and Weinberg
Watson and Crick
Which of the following conditions is known to be multifactorial
Down’s syndrome
Marfan’s syndrome
achondroplasia
atherosclerosis
When two copies of a mutant allele produce a phenotype more severe than one
mutant and one normal allele, we have:
dominant inheritance
recessive inheritance
partial dominance
codominance
Two patients have the same eye colour. They have the same
phenotype
genotype
mutation
epistasis
If an individual has two dissimilar alleles for a trait, with regard to that trait he is said
to be:
heterozygous
homozygous
hemizygous
heterogametic
The type of gene interaction in which the effects of one gene override or mask the
effects of other non-allele genes is called:
linkage
mutation
pleitropy
epistasis
Which of the following represents a testcross?
Ww x WW
ww x WW
Ww x Ww
none of the above
The appearance resulting from a given gene combination is referred to as the
genotype
phenotype
phototype
alleleotype
What is the principle behind the Law of Independent Assortment?
Characters are determined by genes.
Each gamete has an equal chance of posses either member of a pair of homologous
chromosomes.
Genes on chromosomes will be distributed randomly
Genes occur in pairs.
What is a gene?
a unit of heredity on a chromosome
a protein on the surface of a cell
a variation of a unit of heredity on a chromosome
the first generation of offspring
What is the difference between phenotype and genotype.
Phenotype is the physical expression of traits and genotype is all of the alleles in the
organism.
Genotype is the physical expression of a trait and phenotype is all of the alleles in the
organism.
Phenotype are the alleles that are masked and genotype are the alleles that are
expressed.
Phenotype is when both alleles are the same and genotype is when the alleles are
different.
What is a definition of codominance?
A situation in which both alleles are expressed equally.
A situation in which the heterozygous genotype results in an intermediate
characteristic.
A pair of alleles that are different.
A unit of heredity on a chromosome.
If individual is able to taste PTC (dominant trait) then which of the following
genotypes is that person most likely to be?
homozygous dominant
homozygous recessive
heterozygous
none of the above
An allele is ___.
one of the bases in DNA
an alternate form of a gene
another term for epistasis
present only in males and is responsible for sex determination
In dihybrid crosses, the ratio 9:3:3:1 indicates
codominance
independent assortment
partial dominance
three alleles for each trait
The fundamental Mendelian process which involves the separation of contrasting
genetic elements at the same locus would be called
segregation
independent assortment
continuous variation
discontinuous variation
To determine if an organism with a dominant phenotype is heterozygous, one can
perform a ___.
reciprocal cross
dihybrid cross
test cross
monohybrid cross
From which grandparent or grandparents did you inherit your mitochondria? Is it
your:
mother's parents
paternal grandfather
grand mothers
maternal grandmother