Answered: 25. A researcher performed a testcross…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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A researcher performed a testcross with of an individual that was Dd Hh genotype. Which ratio would best represent the expected genotypic results from a data set of 400 offspring?
The answer is D, but why?

25. A researcher performed a testcross with of an individual that was Dd Hh genotype. Which ratio
would best represent the expected genotypic results from a data set of 400 offspring?
a. 300:100
b. 100:200:100
C. 225:75:75:25
d. 100:100:100:100
e.
25:50:25:50:100:50:25:50:25

Expert Solution

Step 1: Testcross

A testcross is a genetic cross or breeding experiment that is used to determine the genotype of an organism that expresses a dominant trait but may also have a hidden or recessive allele for another trait. It entails mating the person with the dominant phenotype (the one you want to test) with a person who is homozygous recessive for all of the traits in question.

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