the scenario and answer the questions belc asis is a term scientists use to describe how ty can "mask" or hide another gene's activit are more than one gene that determine th ene (B) controls the color: black or brown. s black hair, bb individuals have brown hair. er gene (N) controls the presence of any p allele allows individuals to have color in their n individuals are albino and look pale white ink eyes. viduals who have two n alleles will not show black or brown coloring. The N gene "masH gene. Scientists would say that the N gene Fic to the B gene. the information below and answer the qu ht. Use whatever method you would like t m; use the space below for your work. ozygous black female, ozygous for albinism brown heterozygou type: 4. Phenotype: type: 5. Genotype: etes: 6. Gametes:
the scenario and answer the questions belc asis is a term scientists use to describe how ty can "mask" or hide another gene's activit are more than one gene that determine th ene (B) controls the color: black or brown. s black hair, bb individuals have brown hair. er gene (N) controls the presence of any p allele allows individuals to have color in their n individuals are albino and look pale white ink eyes. viduals who have two n alleles will not show black or brown coloring. The N gene "masH gene. Scientists would say that the N gene Fic to the B gene. the information below and answer the qu ht. Use whatever method you would like t m; use the space below for your work. ozygous black female, ozygous for albinism brown heterozygou type: 4. Phenotype: type: 5. Genotype: etes: 6. Gametes:
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:Epistasis
Read the scenario and answer the questions below.
Epistasis is a term scientists use to describe how one gene's
activity can "mask" or hide another gene's activity. In rats,
there are more than one gene that determine the rat's coat
color.
Allele Notation Key:
B = black hair b = brown hair
N = pigmented n albino
%3D
%3D
%3D
One gene (B) controls the color: black or brown. The B allele
causes black hair; bb individuals have brown hair.
Write a fraction for the offspring will have each
trait:
Another gene (N) controls the presence of any pigment at al.
The N allele allows individuals to have color in their
fur, nn individuals are albino and look pale white
with pink eyes.
7. bb genotype (disregarding the albinism gene):
8. BB or Bb genotype (disregarding the albinism
gene):
So individuals who have twonalleles will not show
either black or brown coloring. The N gene "masks"
the B gene. Scientists would say that the N gene is
epistatic to the B gene.
Fill out the information below and answer the questions on
the right. Use whatever method you would like to solve this
problem; use the space below for your work.
9 nn genotype:
10. NN or Nn genotype:
I. albino:
heterozygous black female,
heterozygous for albinism
brown male,
heterozygous for albinism
12. brown hair:
13. black hair:
L Phenotype:
4. Phenotype:
2. Genotype:
5. Genotype:
3. Gametes:
6. Gametes:
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