Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 18, Problem 3TY

A female mouse that is Igf2 Igf2 is crossed to a male that is also Igf2 Igf2. The expected outcome for the phenotypes of the offspring from this cross is

  1. a. all normal size.
  2. b. all dwarf.
  3. c. 1 normal size : 1 dwarf
  4. d. 3 normal size : 1 dwarf.
  5. e. 1 normal size : 3 dwarf.
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A female mouse that is Igf2 Igf2− is crossed to a male that is also Igf2 Igf2−The expected outcome for the phenotypes of the offspring for this cross isa. all normal size. c. 1 normal : 1 dwarf.b. all dwarf. d. 3 normal : 1 dwarf
Two normal-looking fruit flies were crossed, and, in the progeny, there were 202 females and 98 males.a. What is unusual about this result?b. Provide a genetic explanation for this anomaly.c. Provide a test of your hypothesis.
In cats, the gene for calico (multicolored) cats is both sex-linked and codominant. Due to a phenomenon known as dosage compensation, females that receive a B and an R gene have black and orange splotches on white Males can only be black or orange, but never calico. a. What would a calico cat’s genotype be? b. Show the cross of a female calico cat with a black male. What percentage of the kittens will be black and male? c. What percentage of the kittens will be calico and male?                                d. What percentage of the kittens will be calico and female? e. Show the cross of a female black cat with a male orange cat. f. What percentage of the kittens will be calico and female? What color will all the male cats be?
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