1. For the gene flower color choose two colors (alleles) and the letters you wil
ID: 64181 • Letter: 1
Question
1. For the gene flower color choose two colors (alleles) and the letters you will use to represent them. Now write out the genotype, phenotype and gametes for a plant that is heterozygous for the petal color gene. 2. For two genes, petal color and leaf shape, once again designate the alleles for these genes by choosing two colors and two leaf shapes and the letters you will use to represent the alleles for each gene. Now write out the genotype, phenotype and gametes for a plant that is heterozygous for both genes. 3. Sickle-Cell Anemia is caused by an inherited autosomal recessive gene that causes mis-shapen hemoglobin which leads to sickle shaped red blood cells. Two carriers mate. a. Explain what is meant by an autosomal recessive gene. b. What is the probability that their first child will have sickle-cell anemia? c. What is the probability that a child will be a carrier? d. Their first child is born and does have sickle-cell anemia. What is the probability that their second child will be born with the disease? 4. Cystic Fibrosis is caused by an autosomal recessive gene that causes the production of excessively thick mucus in humans. The abnormal mucus interferes with both lung and intestinal function, potentially leading to death. A healthy woman mates with a man who has cystic fibrosis. a. Are the genotypes of the parent?s definitive? Why or why not? b. What are the genotypes of the parents? C. what is the probability that this couple has a child with cystic fibrosis? D. if they have a second child, does the probability change?Explanation / Answer
1. Purple color (PP); and white color (pp).
Genotype – Pp
Phenotype – purple
Gametes – Pp
3.
a. Autosomal recessive gene is a gene that needs two alleles to express the trait. A single allele of this is not enough to manifest the traits.
b. 50% of children have the chance of getting sickle-cell anaemia.
c. 50% of children will be carriers.
d. The second child has 25% probability of having the disease.
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