Test cross, Biology

TEST CROSS

Crossing of F hybrid with its homozygous recessive parent is called test cross and the progeny of test cross is called test cross progeny.

A .      Monohybrid Test Cross

1773_monohybrid test cross.png

Thus monohybrid test cross ratio = 1 : 1

B .      Dihybrid Test Cross

1691_dihybrid test cross.png

So dihybrid test cross ratio = 1 : 1 : 1 : 1

C.      Trihybrid Test Cross

It involves crossing of a trihybrid (Rr Yy Cc) with triple recessive (rr yy cc). The eight different phenotypes will be obtained in 1 : 1 : 1 : 1 : 1 : 1 : 1 : 1 ratio.

Uses of a Test Cross

The test cross reveals the genotype of an organism displaying the dominant phenotype, hence its name.

Posted Date: 10/10/2012 4:07:09 AM | Location : United States







Related Discussions:- Test cross, Assignment Help, Ask Question on Test cross, Get Answer, Expert's Help, Test cross Discussions

Write discussion on Test cross
Your posts are moderated
Related Questions
What is the role of radiographic evaluation in implant treatment? Radiographic examination is very different with implants than with teeth. Radiographs are frequently used in i

1. Many bacterial genes show adaptive regulation of their transcription. a) How is the lac operon regulated by the sigma factor? b) How is the lac operon regulated by lactose

Q. Why is there a "popping" sound when you crack your knuckles, and is it dangerous to crack them? Some reasons have been given for the characteristic "popping" sound associate

Uterine infections Uterine bacterial contamination compromises uterine functions. Initially, the uterus is contaminated with a wide range of bacteria, but this is not consiste

Q. What is the basic importance of water for enzymatic activity? Ans. Biological catalysts, Enzymes, relay on water to reach their substrates and attach to them. There is

Q. Of what substances is the nucleolus made? Is there a membrane around the nucleolus? Nucleolus is a region within the nucleus made of proteins and ribosomal RNA (rRNA). It is

What are bacteriophages? Bacteriophages are viruses specialized in parasitism of bacteria. They are used in genetic engineering as molecular cloning vehicles to insert recombin

What are extraembryonic membranes? Extraembryonic membranes are membranous structures that appear in parallel with the embryo and play significant roles in the embryonic develo

The human blood group, related to the MN system is controlled by two alleles, S and s. Three distinct phenotypes can be identified by mean of biochemical tests. Among 1000 Britishe

What is Archaebacteria ? Archaebacteria is a relatively new grouping that was created in the light of relatively recent biochemical and electron microscopic evidence. These fin