Given the inheritance pattern of coat color in rats described in ...

Question

Given the inheritance pattern of coat color in rats described in Problem 17, predict the genotype and phenotype of the parents who produced the following offspring:

9/16 gray: 3/16 yellow: 3/16 black: 1/16 cream

Accepted Answer

Hey everyone, Let's take a look at this question together. A test cross is used to identify the genetic makeup of an organism. Why can't we utilize the phenotype is to determine the dominant traits. Let's think back to what the test cross is and the main purpose of a test cross to try to figure out why we can't use the phenotype is to determine the dominant trait. So we know that when we're using a test cross, we are testing an unknown genotype of a species against a known dinner type. And so let's say that unknown species that we're testing has black for and the known genotype has white for. And we know that the known genotype is Little B Little B. We can say that the illegal for white fur is the recessive. However, because we don't know this unknown genotype here, we have to say it's either that Hamas is dominant or the hetero zegas. And so we have have to use that test cross to identify what the genetic makeup is of that organism. And so we're not allowed to use the phenotype because sometimes the phenotype do not always reflect the genotype is because those recessive alleles can be masked by these dominant alleles. And so answer choice C. Is the correct answer because we know that phenotype aren't accurate representations of the genotype because sometimes those recessive alleles are masked by the dominant allele. So we can't utilize the phenotype to determine the dominant traits, which means that answer choice. C is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

Given the inheritance pattern of coat color in rats described in Problem 17, predict the genotype and phenotype of the parents who produced the following offspring: 9/16 gray: 3/16 yellow: 3/16 black: 1/16 cream

Key Concepts

Mendelian Inheritance

Genotype and Phenotype

Punnett Square

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