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Cystic fibrosis is a human disease caused by an autosomal recessive mutation. About 1 in 22 people in the human population are heterozygous carriers and have no symptoms of the disease. A woman who has a brother with CF marries a man who has no history of CF in his family. a) What are the possible genotypes of the woman? b) What is the most likely genotype of the man? c) What is the percentage of offspring that would be affected with CF, depending upon the genotype of the mother?
Alleles a, b and c are recessive. Females heterozygous for the 3-loci are crossed to phenotypically a b c males. The progeny are phenotypically.
Ovules from a pure-breeding yellow plant are fertilized with pollen from a pure-breeding green plant. All of the progeny are yellow. When the reciprocal cross is performed, all of the progeny are green.
Face and body creams that are marketed to women in order to "rejuvenate the skin, and get rid of the fine lines and wrinkles" consists of large quantities of collagens.
If a trait had a broad-sense heritability of 1, what would it mean? 0.5? 0? What type of traits has a broad-sense heritability of 1? What type of traits has a heritability of zero?
Discuss the advantages of sexual reproduction in plants over asexual reproduction.
Tay Sachs disease is inherited as an autosomal recessive. It is a devastating neurological disease that results from the lack of a normal enzyme "A" whose job is to metabolize lipids that are found in brain cells.
What is the difference in H+ ion concentration between a solution that is pH 4 and a solution that is pH 5? Explain your reasoning.
How could these three cell types be clearly and simply distinguished from each other in an experimental laboratory and how and where do these different cell types differentiate to their mature functional characteristics?
How does the lymphatic system transport lymph back into the bloodstream?
Coat color in cats is a codominant trait and is also located on the X chromosome. Cats can be black, yellow or calico. A calico cat has black and yellow splotches. In order to be calico, the cat must have an allele for the black color and an allel..
Sometimes mammalian tumor cells grow so quickly that they outgrow the formation of blood vessels and thus must grow with inadequate oxygen supplies.
What is the main difference between eukaryotic RNA polymerases
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