Genetics 1 Online Test

Which 6th Amino acid of b chain of hemoglobin is changed when normal hemoglobin HbA is______ changed to Hbs
Glutamic acid
Rh -ve individuals are
homozygous dominant
homozygous recessive
possess only one gene R or r
A couple each carries the allele for phenylketonuria ; neither of them has disease ; the probability of their child having disease is
Traits that are coded for in auto some, but appear more frequently in one of the sexes are_________ traits
sex dominant
sex limited
Traits that are coded for in autosomes but expressed only in one sex due to effect of sex -hormones are
none above
Which statement about a test cross is not true ?
It tests whether an unknown individual is homozygous or heterozygous
The test individual is crossed with a homozygous recessive individual
If the test individual is heterozygous, the progeny will have a l : l ratio
If the test individual is homozygous, the progeny will have a 3:1 ratio.
Test cross results are consistent with Mendel's model of inheritance.
Which statement about an individual that is homozygous for an allele is not true?
Each of its cells possesses two copies of that allele
Each of its gametes contains one copy of that allele.
It is true-breeding with respect to that allele
Its parents were necessarily homozygous for that allele
It can pass that allele to its offspring.
Which statement about alleles is not true?
They are different forms of the same gene.
There may be several at one locus
One may be dominant over another
They may show incomplete dominance
They occupy different loci on the same chromosome
The phenotype of an individual
depends at least in part on the genotype.
is homozygous
determines the genotype.
is the genetic constitution of the organism
is either monohybrid or dihybrid.
Individual heritable traits
are always determined by dominant and recessive alleles
always vary discontinuously
can sometimes be controlled by many genes
were first studied in the twentieth century
do not exist outside the laboratory.
In epistasis
nothing changes from generation to generation
one gene alters the effect of another.
a portion of a chromosome is deleted
a portion of a chromosome is inverted
the behavior of two genes is entirely independent.
The sex of a honeybee is determined by
ploidy, the male being haploid
X and Y chromosomes, the male being XY
X and Y chromosomes, the male being XX
The number of X chromosomes, the male being XO
Z and W chromosomes, the male being ZZ.
In the F2 generation of a dihybrid cross
four phenotypes appear in linked condition
four phenotypes appear in the ratio 9:3:3:1 if the loci are unlinked
two phenotypes appear in the ratio 3:1 if the loci are unlinked
three phenotypes appear in the ratio 1:2:1 if the loci are unlinked.
two phenotypes appear in the are linked. ratio 1:1 whether or not the loci
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Genetics is a field of biology that deals in heredity and variation in living things. All living things inherit different traits from their parents . The idea is being used since prehistoric times to improve crops and animals through selective breeding. Modern genetics was set into action with the work of Gregor Mendel from the mid-nineteenth century. The physical basis for heredity as we know now are the units of inheritance called genes.



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565 days 10 hours 16 minutes ago

hemsagaruprety uprety

sir please give answer also

4289 days 11 hours 6 minutes ago


thanks for these questions these are really helpful

4478 days 15 hours 52 minutes ago


Good n helpful

4512 days 4 hours 23 minutes ago

Professor/SME/Instructor in Biology (NEET/AIIMS)
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