Answered: A. Examine the crosses above and deduce…

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 New World cotton species Gossypium hirsutum has a chromosome number of 52. The Old World Species thurberi and G. herbaceum each have a 2n number of 26. Hybrids between these two species show the ff. chromosome pairing arrangements at meiosis:

Hybrid Pairing arrangement

hirsutum x G. thurberi 13 small bivalents + 13 large univalents
hirsutum x G. herbaceum 13 large bivalents + 13 small univalents
thurberi x G. herbaceum 13 large univalents + 13 small univalents

A. Examine the crosses above and deduce the origin of G. hirsutum. Diagram your cross and give level of ploidy in your crosses, including gametes. Distinguish between chromosomes in your crosses.

B. Diagram the three crosses above. Distinguish between the chromosomes and indicate the level of ploidy of hybrids formed from the above crosses.

C. A monosomic G. hirsutum is crossed with G. thurberi and produces offspring, some with 39 chromosomes and some with 38 chromosomes. Using cytological examination at meiosis, the 38-chromosome types show 13 bivalents and 12 univalents. Explain these results by making the pertinent crosses.

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