University Genetics

In cats fur colour can be black, orange or tortoise (patched orange and black). A mating
between two cats produces the kittens indicated below.
P: tortoise female X orange male
F1: orange females
tortoise females
black males
orange males
What are the genotypes of the parents and F1 progeny, if fur colour is controlled by X-linked
alleles?

  1. 👍 0
  2. 👎 0
  3. 👁 192
asked by MJ
  1. The fact that fur colour can be tortoise means that both phenotypes are expressed, as a result of codominance of the genotypes black and orange.

    Since we are given that fur colour is controlled by X-linked alleles, it means that tortoise can only be inherited in females (XX) where there are two X-alleles. In males (XY), the only X-allele will control the fur colour, namely black or orange.

    If
    O=orange
    B=black
    Y=Y-allele (from male only), irrelevant in fur colour.
    Then the male parent is OY (orange), and the female parent is OB (tortoise).
    Resulting in F1 as
    OY (orange male)
    BY (black male)
    OB (tortoise female)
    OO (orange female)
    exactly as given in the question above.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Biology

    Orange color in non-pedigreed cats is controlled by the O locus. The non-orange phenotype, if not diluted, appears as black coat color. Perform the following reciprocal crosses: Orange blotched female X black blotched male Black

    asked by claire on February 10, 2009
  2. biology

    North American wolves can have gray fur or black fur. A single gene with two alleles codes for fur color. Information about the fur color of parents and offspring in four wolf families is shown below. Family 1 | gray fur x black

    asked by elizabeth on January 2, 2019
  3. Genetics

    In cats the allele B produces black, whereas b produces yellow. Neither gene is dominant, and in the heterozygous state the phenotype is a combination of yellow and black spots called tortoise-shell. The alleles B and b are

    asked by Whitney on April 5, 2011
  4. Science (Biology)

    In a species of rodent, fur colour may be black or brown and their tail length either long or short. A pair of rodents were crossed, and their progeny then allowed to interbreed. The result in the F2 were as follows: 29 with brown

    asked by Khalid on July 30, 2016
  5. Biology

    In a certain species of rabbit, black fur is dominant to white fur. A male rabbit with black fur that is a heterozygote is crossed with a female rabbit with black fur, which is also a heterozygote. Using a Punnett square, show

    asked by Sam on March 5, 2019
  6. math

    Color Number of Marbles Blue 4 Black 2 Red 5 Orange 4 Green 5 Rachel has 20 marbles in a jar. This table shows the number of blue, black, red, orange, and green marbles. What is the probability that if she randomly drew a marble

    asked by tariq on May 16, 2013
  7. Introduction to Graphic Design

    Hi! ____ 9. What is the most difficult color combination to read? (1 point) a) black and blue b) black and pale yellow c) pale orange and white d) red and black Could someone please help me? Thanks!

    asked by Da Fash on December 14, 2017
  8. math

    A jar contains 21 red, 4 black, 12 orange, and 18 pink marbles. A marble is drawn at random. P(black) I think 4/55

    asked by Anonymous on March 13, 2014
  9. Maths

    A glass jar contains 15 red,13 green,4 black,9 orange,11 yellow and 12 blue marbles A)If I choose one marble at random from the jar,what is the probability that it is: i) blue? ii) black? iii) not black?

    asked by Mamello on November 2, 2018
  10. NATURE OF ELECTRICITY

    If a charged sphere is brought close to a rod as shown in Figure A, the pairs of pith balls suspended at the ends of the rod will as the figure im reading is showing there is a charged sphere to the left then a induced charged on

    asked by nick on April 24, 2014

More Similar Questions