What is the purpose of a testcross?To determine the genotype of offspring from a cross.To determine if a parent has a lethal allele.O To determine the genotype of a parent with an unknown phenotype.To determine is a trait is inherited.

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Description: What is the purpose of a testcross?To determine the genotype of offspring from a cross.To determine if a parent has a lethal allele.O To determine the genotype of a parent with an unknown phenotype.To determine is a trait is inherited.

The allele combination is called "genotype" while the observable traits are called "phenotype". The…

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What is the purpose of a testcross? To determine the genotype of offspring from a cross. To determine if a parent has a lethal allele. To determine the genotype of a parent with an unknown phenotype. To determine is a trait is inherited.

What is the purpose of a testcross? To determine the genotype of offspring from a cross. To determine if a parent has a lethal allele. To determine the genotype of a parent with an unknown phenotype. To determine is a trait is inherited.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 16CTQ: Use a Punnett square to predict the offspring in a cross between a tall pea plant (heterozygous) and...

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What is the reason for doing a test cross?a. to identify heterozygous individuals with the dominant phenotypeb. to determine which allele is dominant and which is recessivec. to identify homozygous recessive individuals in the F2d. to determine if two genes assort independently
What does a Punnett square illustrate? A. The phenotypes of all offspring in a test cross. B. The genotypes of all possible offspring in a test cross. C. The phenotypes of all possible offspring in a test cross. D. The genotypes and phenotypes of all possible offspring in a test cross.
The cross between a female white giraffe and a pigmented male resulted in white offspring. What is the genotype of the father? Draw the test cross.
Understand the the given genetic problem. Draw the Punnet square using a clean paper and analyze the results. A cross between true breeding plants for red (R) flower and white (r) flower results to all red flowers in F1. Based on the results, red color is dominant while white color is recessive. Use Punnett square to show the result of genetic cross and analyze the results.
In a cross, Aa Bb Cc Dd Ee x Aa Bb cc Dd ee, what proportion of offspring are expected to be homozygous recessive for all five genes? show your work.
When geneticists have an organism that displays the dominant trait but do not know the genotype, a test cross can be performed to help determine this. A test cross is performed by mating a _________________ with the organism and looking at the physical traits of the offspring.
Suppose that you are raising Mongolian gerbils. You notice that some of your gerbils have white spots, whereas others have solid coats. What type of crosses could you carry out to determine whether white spots are due to a recessive or a dominant allele?
In flowers, the red color is codominant with the white color If a red flower is crossed with a white flower Predict the offspring genotypes and phenotypes .
A heterozygous purple bird was crossed with a blue-feathered bird. One white-feathered offspring resulted from the cross. What is the genotype of the blue-feathered bird? (3 marks - 2 marks for the correct genotype with an explanation as to how you determined your answer, 1 mark for the Punnett square)
Use a Punnett square to predict the offspring in a cross between a tall pea plant (heterozygous) and a tall pea plant (heterozygous). What is the genoypic ratio of the offspring?
You decide to breed a pair of guinea pigs, one black and one white. In guinea pigs, black fur is caused by a dominant allele (B) and white is due to homozygosity for a recessive allele (b) at the same locus. Your guinea pigs have seven offspring, four black and three white. What are the genotypes of the parents? Why is there a 1:1 ratio in this cross?
Use a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous recessive) and a tall pea plant (heterozygous). What is the phenotypic ratio of the offspring?