Consider the following crosses in canaries: a) pink-eyed female x pink-eyed male = all pink-eyed. b) black-eyed female x pink-eyed male = All males black Which allele is dominant and how is eye-colour inherited? black is dominant - autosomal gene pink is dominant - autosomal gene black is dominant - X-linked gene pink is dominant - X-linked gene pink is dominant - sex-influenced female autosomal
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This cross shows that when two pink-eyed individuals are crossed, all offspring are pink-eyed. This suggests that pink-eyed is a true-breeding trait. If pink were recessive, then two recessive individuals would produce all recessive offspring. If pink were Show more…
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The cinnamon variety of canary, which has brown-tinted feathers, due to the presence of chocolate-colored melanin and the absence of black melanin, has pink eyes. The green variety (a misnomer since it has both of these pigments in its feathers and is black in color) has black eyes. Eye color is controlled by a single gene. When two pink-eyed birds are mated, the progeny are always pink-eyed. When pink-eyed hens are mated with black-eyed cocks, all the offspring of both sexes are black-eyed; and when black-eyed hens and pink-eyed cocks are bred together, all male offspring are black-eyed and females are pink-eyed. A. Black eyes are dominant and Z-linked. Explain. (You may show each cross.) B. What phenotypic results would you expect in the F1 and F2 of the cross of true-breeding black males and pink females? Show your reasoning. C. Describe the breeding procedure you would use with the F2 progeny from the cross in B to establish a true-breeding variety of pink-eyed canaries. Would it be easier to establish a true-breeding variety of black-eyed canaries? Explain.
Sri K.
In canaries the green variety (with black eyes) is dependent upon a dominant X-linked gene (B), and the cinnamon variety (with red eyes) on its recessive allele (b). A cinnamon male is mated to a homozygous green female. What would be the phenotype of the F1 and the F2 generations?
Josee P.
In some cats, black color is due to a sex-linked (X-linked) (chapter 15) recessive gene (Xb); the dominant allele (XB) produces orange color. The heterozygote (XBXb) is calico. What kinds of offspring would be expected from the cross of an orange male and a black female? orange females, black males black females, calico males calico females, black males black females, orange males QUESTION 4 In snapdragons, heterozygotes have pink flower, whereas homozygotes have either red or white flowers. When plants with red flowers are crossed with plant with white flowers, what proportion of the offspring will have pink flowers? 50% 75% 100% 25%
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