5. (4 points) Your rabbit colony has individuals with two different shapes of ea

Question

5. (4 points) Your rabbit colony has individuals with two different shapes of ears, round and oval. Interestingly, you find that the ear shape gene is found on the X-chromosome (meaning that it is X-linked). The oval ear is dominant to the round ear. You choose to mate a non- purebred female to an oval-eared male. Please answer based on the information below. a. (1 point) What is the genotype of the female and what is the genotype of the male? b. (1 point) What is the phenotype of the female? C. (2 points). After performing the cross, what are the phenotypic and genotypic ratios of the resulting offspring? 6. (4 points) Super pavement ants have genes that encode both length and body pigment color These genes are not on the same chromosome (meaning that they are not linked). For bod color, red pigment is dominant to tan and for leg length, short is dominant to long. You can use the letter (L) for the body length gene and the letter (R) for body color. Your Po generation consists of a purebred short body, black ant to a long body, red super pavement ant. a. (0.5 points) What is the genotype of the short, red pigmented super pavement ant? b. (0.5 points) What is the genotype of the long, tan pigmented super pavement ant? c. (1 point) You perform this initial cross to create the Fi generation. What is the genotypic ratio of this generation? d. (2 points) Then you take two Fi super pavement ants and cross them. What is the phenotypic ratio of the F2 generation?

Explanation / Answer

Genotype                    (Female) XRXr             XRY (Male)

Phenotype                   Oval shape ear            Oval shape ear

Gamete                        XR          Xr                    XR        Y

Offspring                    XRXR   XRY    XRXr     XrY

Phenotypic ratio          3 Oval ear : 1 Round Ear

Genotypic ratio           1: 2: 1

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