The individual which shows heterogametic sex. Introduction: The mechanism of sex determination differs from one species to another. Secondary sexual characteristic of an individual helps in the determination of its sex. Various environmental factors are responsible for the determination of sex as interaction between the environment and genes provides the criteria in the production of male and female.

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In fruit flies and humans, sex is determined by an X-Y system. However, many organisms do not have the X-Y system of sex determination just like in birds. Instead, they have the Z-W system. Male birds are ZZ whereas, female birds are ZW. In chickens, barred feathers (ZB) are dominant over nonbarred feathers (Zb). If a barred female chicken mates a nonbarred male chicken, what is the probability of having barred female offspring? 50% 0% 25% 100%

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Chapter 7, Problem 9QP

Summary Introduction

To explain: The individual which shows heterogametic sex.

Introduction: The mechanism of sex determination differs from one species to another. Secondary sexual characteristic of an individual helps in the determination of its sex. Various environmental factors are responsible for the determination of sex as interaction between the environment and genes provides the criteria in the production of male and female.

Summary Introduction

To explain: The alien sex (female or male) is heterogametic.

Introduction: The mechanism of sex determination differs from one species to another. Secondary sexual characteristic of an individual helps in the determination of its sex. Various environmental factors are responsible for the determination of sex as the interaction between the environment and genes provides the criteria in the production of male and female.

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In fruit flies and humans, sex is determined by an X-Y system. However, many organisms do not have the X-Y system of sex determination just like in birds. Instead, they have the Z-W system. Male birds are ZZ whereas, female birds are ZW. In chickens, barred feathers (ZB) are dominant over nonbarred feathers (Zb). If a barred female chicken mates a nonbarred male chicken, what is the probability of having barred female offspring? 50% 0% 25% 100%

About 40% of Solomon Islanders carry a gene for blond hair, and yet only 5%–10% of these people actually have blond hair. Why is the number of people with blond hair only 5%–10% when so many people carry genes for blond hair? The duck-billed platypus has a unique mechanism of sex determination: females have five pairs of X chromosomes (X1X1X2X2X3X3X4X4X5X5) and males have five pairs of X and Y chromosomes (X1Y1X2Y2X3Y3X4Y4X5Y5). Do you think each of the X and Y chromosome pairs in males assort independently of other X and Y pairs during meiosis? Why or why not? How is the inheritance of X-linked traits different from the inheritance of autosomal traits? How is the inheritance of X-linked and autosomal traits similar? List as many differences and similarities as you can.

What specific observations (evidence) support the conclusions about sex determination in Drosophila and humans? Sort each observation to the appropriate bin. If an observation applies to both Drosophila and humans, sort it to the "Both" bin. If an observation does not apply to either Drosophila or humans, sort it to the "Neither" bin. Reset Help Three sets of autosomes per X chromosome are required for male fertility. Sex chromosomes are heteromorphic. Maleness is determined by lack of X chromosomes. Triploid individuals (3n) could be phenotypically normal females. XO individuals are male. More than one Y chromosome is needed for maleness. Diploid XXY individuals are abnormal males. Drosophila only Humans only Both Neither Submit Request Answer