Laboratory Manual for Holes Human Anatomy & Physiology Fetal Pig Version
14th Edition
ISBN: 9781259295645
Author: Terry R. Martin
Publisher: McGraw-Hill Education
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Question
Chapter 34, Problem F34.1A
Summary Introduction
To analyze:
The structure of lacrimal apparatus.
Introduction:
Lacrimal apparatus contains some orbital structures for production and drainage of tear. The tears are produced by the lacrimal gland. The fluid is conveyed to the eye surface by the excretory ducts. This helps in removal of waste, maintaining moisture, and lubrication.
Expert Solution & Answer
Explanation of Solution
The structure of lacrimal apparatus is labeled in the figure.
Lacrimal gland is the tear producing part of lacrimal apparatus that secretes serous fluid and sent to superior fornix which is a space between eyeball and eye lids.There are two lacrimal canal in lacrimal apparatus that is superior lacrimal canal and inferior lacrimal canal. These canals open in medial corner of the eye with puncta lacrima from where tears drainage system begins.Lacrimal sac is a nasolacrimal ducts dilated portion present between lacrimal bone and frontal process of maxilla.Nasolacrimal duct is the final part lacrimal apparatus which opens into nasal cavity, mainly into inferior nasal meatus. The fluid drains finally into this duct.
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Question #3:
In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would
transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming
there was just one gene conferring gametophytic obligate apomixis, and that the two parents are
inbreds, what would be the consequences of such a cross if:
a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the parental cross.
b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the…
Question #5:
Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The
genes show independent assortment. Recessive alleles at both loci are required for the facultative
apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C.
At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype.
A facultative apomict male, capable of producing viable pollen, was crossed with a sexually
reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic
ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following
temperatures*:
a) 15°C?
b) 25°C?
*for full credit, show crosses and genotypes where appropriate. Remember to position the
female first (left side) in the cross.
Type your answer here:
Chapter 34 Solutions
Laboratory Manual for Holes Human Anatomy & Physiology Fetal Pig Version
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