Multiple alleles are present
On different chromosomes
At different loci on the same chromosome
at the same locus of the chromosome
at the same locus of the chromosome
C.
at the same locus of the chromosome
Multiple alleles are present at the same locus of the chromosomes. A classical example of multiple alleles is found in ABO blood group system of humans. Despite the multiple alleles of any gene, an individual possess and can have only two alleles at a time.
The idea of mutations was brought forth by
Hugo de Vries, who worked on evening primrose
Gregor Mendel, who worked on Pisum sativum
Hardy Weinberg, who worked on allele frequencies in a population
Hardy Weinberg, who worked on allele frequencies in a population
A.
Hugo de Vries, who worked on evening primrose
Hugo de Vries worked on evening primrose (Oenothera lamarckiana) and put forward the idea of mutation.Alleles are
different phenotype
true breeding homozygotes
different molecular forms of a gene
different molecular forms of a gene
C.
different molecular forms of a gene
Alleles are different molecular forms of a gene, representing alternate forms of a given character.
Height of a pea plant-T for tallness and t for dwarfness.
T and t are alternate forms for given character of height.
Heterozygotes and homozygotes refers to inheritance of two different and similar travels for a character respectively.
Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?
Phenylketonuria
Sickle cell anaemia
Haemophilia
Haemophilia
C.
Haemophilia
Colourblindness and haemophilia are two main sex-linked or X-linked recessive diseases. The gene of haemophilia goes to son from mother and to daughter from father. In this disease, the blood is fail to clot when exposed to air result in continuous bleeding and leads to death.
An abnormal human baby with 'XXX' sex chromosomes was born due to
formation of abnormal sperms in the father
formation of abnormal ova in the mother
fusion of two ova and one sperm
fusion of two ova and one sperm
B.
formation of abnormal ova in the mother
Formation of an abnormal ova usually occurs as an event during the formation of reproductive cells.
An error in cell division called non-disjunction can result in reproductive cells with additional chromosomes. Any of these cells if contributes in the genetic make up of child leads to trisomy of X-chromosome i.e. the child will have an extra X-chromosome. ZZ+ XX in mother will lead to birth of XXX genotype baby.
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