A dihybrid cross describes a mating between two organisms that are different for two traits are called……...
a) law of dominance
b) law of purity
c) law of unity
d) law of independent assortment
Explanation: Mendel's law of independent assortment states that the alleles of two (or more) different genes get sorted into gametes independently of one another. In other words, the allele a gamete receives for one gene does not influence the allele received for another gene.
Which of the following F1 generation is produced in the result of dihybrid cross with RRYY and rryy?
a) RRyy
b) Rryy
c) RrYy
d) rrYy
Explanation: this generation is heterozygous for both traits
In a dihybrid cross, out of 16 plants obtained, the of genotypes shall be…….
a) 9
b) 4
c) 16
d) 12
What type of gametes will be formed by genotype RrYy?
a) Rr, RR, Yy, YY
b) Ry, Ry, Yy, ry
c) RY, Ry, ry, ry
d) RY, Ry, rY, ry
What is the ratio of homozygous plants for both dominant character in F2 of a dihybrid cross?
a) 9/16
b) 4/16
c) 3/16
d) 1/16
Explanation: e.g. in a cross between RrYy and RrYy, only one RRYY will be produced
The cross between two dissimilar individuals is called………
a) hybridization
b) back cross
c) test cross
d) interbreeding
