Biology

01. Question number three has multiple sections. Please answer all parts

I. We know that the most common form of color blindness results from an X- linked recessive gene. A couple with normal color vision has a daughter with normal vision and a son who is color-blind. What is the probability that the daughter is a carrier for the color-blindness allele? In other words, what is the probability that the daughter is heterozygous for the trait?

II. When black pigeon is crossed with a test cross (White) pigeon gives you 100% brown pigeons. What are the genotypes and phenotypes of a cross between F1*F1

III. In the pedigree below, the shaded symbols represent people affected with a neurological disorder caused by an X-linked recessive allele. Let’s call the normal allele and the recessive allele d. What are the genotypes of every person in this pedigree?

First generation

Third generation

second generation

IV. What are the genotype and phenotypes of the following individuals

Brown skin, Long tail * Black Skin * short tail

(F1) Brown skin * long tail (100%)

If cross F1*F1 ( what are the possible gene typical and phenotypical ratio

V. Color of the lotus flower is determined by the allele red (R ). Shape of the petals is determined by the allele long (L). Cross between two homozygous dominant and homozygous recessive gives pink lotus with flower with long petals. What are the possible genotypes and phenotypes of a cross between two pink, long petals flowers.

VI. Suppose two parents who are both heterozygous haired and heterozygous eyed produce a child.  What are the possible genotypes and phenotypes in the offspring? Black hair over blond and Black eye over blue

VII. What are the genotypes and phenotypes of possible children results in a following crosses

a) Hemophilia carrier mother and healthy father ( X linked mutation)

b) Hemophilic mother and hemophilic father

c) Healthy mother and colorblind father

d) Genetic disorder a is caused by a genetic mutation on the Y chromosome. If so, what are the genotypes of children of unhealthy father and healthy mother

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