Daniel McDonald and Nancy Peer determined that eyespot (a clear spot in the center of the eye) in flour beetles is caused by an X-linked gene (es) that is recessive to the allele for the absence of eyespot (es). They conducted a series of crosses to determine the distance between the gene for eyespot and a dominant X-linked gene for striped (St), which causes white stripes on females and acts as a recessive lethal (is lethal when homozygous in females or hemizygous in males). The cross shown in the diagram was carried out (D. J. McDonald and N. J. Peer, 1961, Journal of Heredity 52:261-264). Ot est St es St est 에는 하는 예능 예능 하 하 es es es es es St+ Y est St 1630 1665 935 1005 1661 1024
Daniel McDonald and Nancy Peer determined that eyespot (a clear spot in the center of the eye) in flour beetles is caused by an X-linked gene (es) that is recessive to the allele for the absence of eyespot (es). They conducted a series of crosses to determine the distance between the gene for eyespot and a dominant X-linked gene for striped (St), which causes white stripes on females and acts as a recessive lethal (is lethal when homozygous in females or hemizygous in males). The cross shown in the diagram was carried out (D. J. McDonald and N. J. Peer, 1961, Journal of Heredity 52:261-264). Ot est St es St est 에는 하는 예능 예능 하 하 es es es es es St+ Y est St 1630 1665 935 1005 1661 1024
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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Transcribed Image Text:Are some potential genotypes missing among the
progeny of the cross? If so, which ones and why?
Both St / Y males and St / St females are missing due
to lethality.
+
+
es es females are missing because they are
linked to lethal St alleles.
No potential genotypes are missing among
the progeny.
+
+
One half of the female es St /es St recombinants
are missing due to lethality.
+
Both es St / Y and es St / Y males are missing due
to lethality.
Transcribed Image Text:Daniel McDonald and Nancy Peer determined that eyespot (a
clear spot in the center of the eye) in flour beetles is caused
by an X-linked gene (eș) that is recessive to the allele for the
absence of eyespot (es). They conducted a series of crosses
to determine the distance between the gene for eyespot and a
dominant X-linked gene for striped (St), which causes white
stripes on females and acts as a recessive lethal (is lethal
when homozygous in females or hemizygous in males). The
cross shown in the diagram was carried out (D. J. McDonald
and N. J. Peer, 1961, Journal of Heredity 52:261–264).
Which progeny shown in the cross diagram are
nonrecombinants (parentals) and which are recombinants?
Calculate the recombination frequency between es and St
using the available data.
Ot
es+ St
es St+
+ +
es St les St
+
+
es St / Y
est
es
nonrecombinant
es St+
es St+
es
St
es St+
St
St+
est St
es
St+
es St+
Y
es+ St
Y
es
+ +
St / Y
recombination frequency:
es St+
Y
+
es St / es St
1630
1665
Answer Bank
935
05
1661
1024
Ô
recombinant
+
es St / es St
+
es St / es St
+
+
%
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