Question

RrYy has deen crossed with rryy. Give a suitadle term of the cross (a)Mono hybridcross (b) Test cross (c) Back cross (d) Self cross​

Answer 1

Answer:

a) Rr × rr Yy × yy

b) RrYy × rryy

c) RrYy× RrYy

d) RrYy× RrYy

Explanation:

Monohybrid cross where only one trait has been considered.

Test cross is as cross between F1 progeny and homozygous recessive parent.

Back cross is a cross between F1 progeny and any of the it's parents.

Self cross is a cross with self or same type.

Answer 2

The suitable term of the given cross is the Test cross.

• A test cross is simply an experimental cross of an individual having a dominant phenotype with a homozygous recessive genotype.
• The genotype of the dominant individual is unknown.
• The unidentified genotype organism is bred with a recessive homozygous trait and the offspring of the tests are observed.
• If the test cross gives any recessive progeny, then the parent organism is heterozygous for the allele in question.
• if the test cross results in only phenotypically dominant offspring, then the parent organism is homozygous dominant for the allele in question.
• The test cross is thus used to determine where the individual is homozygous or heterozygous for a trait.
• Here, When RrYy( unknowm genotype) crossed with rryy yields four progenies having RrYy. Rryy, rrYy and rryy genotypes and it is evident from this that the genotype of the parent in question is heterozygous in nature.
• The test crosses were first used by Gregor Mendel in his plant hybridization experiments.