The inheritance of colour in domestic pigeons involves several genes. The dominance hierarchy of three colour alleles is ash-red > blue-black > brown (ZA > ZB > Zb ). These colours are carried on the Z sex chromosome. Unlike humans, female pigeons have two different sex chromosomes (Z and W) and males have two of the same kind of sex chromosome (ZZ). In birds, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). Since female birds have only one Z chromosome, they have only one copy of all Z-linked genes and they express the phenotype of the allele that they get. Barred is a sex-linked dominant trait in chickens. The barring allele causes white pigment in bars on a solid color producing an alternating pattern. The original solid color in the chickens below is black. The possible genotypes and their corresponding phenotypes are as follows: Genotype Gender Feather Phenotype ZBZB Male Barred ZBZb Male Barred ZbZb Male Black ZBW Female Barred ZbW Female Black Which of the following rows correctly displays the phenotypes of the F1 generation of a cross between a pure breeding barred rooster and a black hen AND a black rooster and a barred hen, respectively? Select one: a. Barred Male Black Female Black Male Barred Female Barred males and black females 100% barred b. Barred Male Black Female Black Male Barred Female 100% barred 2 barred females : 1 barred male : 1 black male c. Barred Male Black Female Black Male Barred Female 100% barred 100% barred d. Barred Male Black Female Black Male Barred Female 100% barred Barred males and black females

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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The inheritance of colour in domestic pigeons involves several genes. The dominance hierarchy of three colour alleles is ash-red > blue-black > brown (Z^A > Z^B > Z^b).

These colours are carried on the Z sex chromosome. Unlike humans, female pigeons have two different sex chromosomes (Z and W) and males have two of the same kind of sex chromosome (ZZ).

In birds, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). Since female birds have only one Z chromosome, they have only one copy of all Z-linked genes and they express the phenotype of the allele that they get.

Barred is a sex-linked dominant trait in chickens. The barring allele causes white pigment in bars on a solid color producing an alternating pattern. The original solid color in the chickens below is black.

The possible genotypes and their corresponding phenotypes are as follows:

Genotype	Gender	Feather Phenotype
Z^BZ^B	Male	Barred
Z^BZ^b	Male	Barred
Z^bZ^b	Male	Black
Z^BW	Female	Barred
Z^bW	Female	Black

Which of the following rows correctly displays the phenotypes of the F1 generation of a cross between a pure breeding barred rooster and a black hen AND a black rooster and a barred hen, respectively?

Select one:

Barred Male Black Female	Black Male Barred Female
Barred males and black females	100% barred

Barred Male Black Female	Black Male Barred Female
100% barred	2 barred females : 1 barred male : 1 black male

Barred Male Black Female	Black Male Barred Female
100% barred	100% barred

Barred Male Black Female	Black Male Barred Female
100% barred	Barred males and black females

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