Principles of Genetics

Starch grain in pea plant shows

• Recessive Epistasis

• Incomplete dominance

• Co-dominance

• Dominant Epistasis

When a heterozygous pea plant with yellow round seeds is crossed with a homozygous pea plant with yellow round seeds, the genotype not obtained is

• YyRr

• YyRR

• YYrr

• YYRR

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following will be used to determine whether the organism is homozygous or heterozygous for a character?

• back cross

• test cross

• reciprocal cross

• dihybrid cross

Which of the following scientists was not associated with rediscovery of Mendelian laws?

• Hugo de Vries

• Carl Correns

• Alfred Sturtevant

• Eric von Tschermak

In pleiotropy,

• The phenotype is determined by the cumulative effect of interacting genes

• One gene mediates more than one phenotype

• Multiple interacting alleles determine the particular phenotype of progeny

• One gene masks the effect of another gene, leading to loss of expression of latter gene

Morgan’s choice of Drosophila has been proven to be useful even today for genetic experiments for following reason(s)

• It has four type of chromosomes

• Easy and inexpensive maintenance with short generation time and large number of offspring

• Very large number of visible as well as biochemically mutant phenotypes

• All of the above

If two gene A and B are linked and show 20% recombination, What will the proportion of gametes produced by F1 with genotype ++/ab, which is derived from to the dihybrid cross between ++/++ and ab/ab parent plants?

• ++ = 80%; ab = 20%

• ++ = 40%; ab = 40%; +a= 10%; +b= 10%

• ++ = 20%; ab= 20%; +a = 20%; +b=20%

• ++ = 50%; ab= 50%

Tags

NGSS.HS-LS4-3

The reason that linked genes are inherited together is that

• they are located on the same chromosome.

• the number of genes in a cell is greater than the number of chromosomes.

• chromosomes are unbreakable

• alleles are paired.

Tags

NGSS.HS-LS3-1

If a carrier woman for haemophilia marries an affected individual, then mark the incorrect statement regarding their progeny.

• Half of the daughters will be affected with haemophilia

• Half of the sons will be affected with haemophilia

• 25% of the total progeny will be carrier for the disease

• 75% of the total progeny will be affected with haemophilia

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Statement I: Combination of genotypes are theoretically represented in a square tabular form known as Punnet square.

Statement II: Genes which code for a pair of contrasting traits are known as alleles.

• Only statement I is true

• Only statement II is true

• Both the statements are true

• Both the statements are false