Inheritance biology

A short length of double stranded DNA molecule has 80 thymine and 80 guanine bases. The total no of nucleotide in the DNA fragments

• 640

• 40

• 320

• 160

An individual of the genotype AaBbCcDdEe can make how many different types of gamates

• 2

• 3

• 8

• 4

Which of the following genotypes would produce the greatest variability of gamates if the alleles assorted Independently

• Aa Bb Cc Dd

• Aa BB CC Dd

• Aa BB Cc DD

• Aa BB Cc Dd

Tags

NGSS.HS-LS3-3

Red hair is recessive trait in humans. In a random mating population in hardy Weinberg equilibrium, approximately 9% of individuals are red - haired. What is the frequency of heterozygotes?

• 49%

• 18%

• 42%

• 81%

Tags

NGSS.HS-LS2-2

NGSS.HS-LS4-3

Two genes A and B located on two different chromosomes of a diploid cell. If an individual heterozygous for the two gene is test crossed what percentage of the progeny will be homozygous for at least one of the genes

• 100

• 75

• 50

• 25

Tags

NGSS.HS-LS3-3

Two genes are located 70 CM apart in the same chromosome. The percentage of the recombination between the two genes would be:

• 35%

• 70%

• Anywhere between 50% and 70%

• ≤ 50%

Tags

NGSS.HS-LS3-3

In a four point (ABCD) cross between Hfr and F- strains of E. Coli, the pair - wise frequencies of recombination fell in the following order:

AB>AC>AD

The most probable order of these genes on the bacterial chromosome would be:

• ABDC

• ABCD

• ADCB

• ACDB

Tags

NGSS.HS-LS3-3

The key difference between dominance and Epistasis is

• Dominance deals with alleles ; Epistasis deals with two genes

• Dominance fits with mendels law; Epistasis is an expectation to independent assortment

• Epistasis is a case of incomplete dominance

• Dominance expresses a relationship between two alleles; epistasis involves three or more

A breeder identified a variegation mutant in the leaf colour in a normal green population of maize. To study the genetics of this green plants using variegation as the female parent. All the F1 and F2 progeny were variegated. The leaf variegation in maize could be due to:

• Maternal inheritance

• Maternal effect

• Mendelian inheritance

• Mendelian inheritance , with variegated being dominant over green

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A test cross is generally carried out to :

• Identify homozygous recessive individuals in the F2

• Determine which alleles is dominant and which is recessive

• Determine if two genes assort independently

• Identify heterozygous individuals with the dominant phenotype