Question

Using Punnett square, try to find out the nature of offspring of a test cross. What ratio did you get? Using the genotypes of this cross, can you give a general definition for a test cross?

Answer 1

Answer:ABOVE ANSWER NEEDS A CORRECTION

Explanation:THE DEFINITION OF TEST CROSS IS. CROSSING OF A TALL PLANT FROM F2 GENERATION NOT fROM F1 GEN. THIS IS WRITTEN IN NCERT CLASS12 2016MODEL PAGE 74. 8 LINE FROM BELOW. U CAN CHECK IT OUT

Answer 2

Answer:

When an organism shows a dominant character for a trait, and its genotype is unknown, cross is performed of this organism with a known homozygous recessive trait in order to know the genotype of the former. This is known as Test cross.

Explanation:

• A plant which displays tall phenotype may have genotype TT or Tt. This phenotypically showing tall plant, is crossed with a known recessive plant, having genotype tt, in order to find out the genotype TT or Tt of the former plant.
• The phenotypic ratio received will determine the genotype of the plant.
• If all the offsprings are tall, then the genotype will be different and if, 50% of the offspring shows tall phenotype, and 50% shows dwarf phenotype, then the genotype will be different.
• Let’s understand this will the help of a Punnett square.

So, this is the test cross with the help of a Punnett square along with definition and nature of offsprings.

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