Answered: Poster 4 cats DISTRIBUTION OF PIGMENT…

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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Question

Pigment produced in cells which are located at the base of growing hairs is packed
into granules which are then transferred to the growing hair shaft. The gene controlling
this transfer of pigment granules to growing hair has the alternative alleles
D : uniform distribution of pigment granules in hair ---- intense colour
d : uneven distribution of pigment granules in hair -------dilute colour
The colour of cats homozygous dd, is diluted as shown below

non dilute		dilute
black	dd	blue
brown	dd	lavender
orange	dd	cream

The colour of cats either DD or Dd is intense, or non-dilute. Note that alternative
names for colours are sometimes used. Seal for black, grey for blue, chocolate for
brown, lilac for lavender and red or yellow for orange. Genetically, there is no
difference between the particular alternatives.

Examine poster 4 – cats.
a. What is the genotype, with respect to the ‘B’ and ‘D’ loci of blue point kitten, lavender point kitten and brown point kitten
b. What is the genotype of the blue cat at the ‘B’ and ‘D’ loci?Is this identical to any of the kittens in the litter shown? If so, at which gene locus does it differ from the kittens to give such a difference in appearance of
colour distribution?

Poster 4 cats
DISTRIBUTION OF PIGMENT
GRANULES IN HAIR OF CATS
blue
point
MAN
blue
point
lavender
point
blue
point
Blue Burmese
Station 4
brown
point

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