b. Two couples are heterozygous for genes that cause albinism, but each gene specifies a different enzyme in the biochemical pathway for skin pigment synthesis. Their children, thus, do not face a 25% risk of having albinism. Answer c. Clara has severe neurofibromatosis type I. She has brown spots on her skin and several large tumors beneath her skin. A gene test shows that her son has inherited the disease-causing autosomal dominant allele, but he has no symptoms. Answer d. Mateo, an apparently healthy 24-year-old basketball player, dies when his aorta ruptures. A younger brother is nearsighted and has long and thin fingers, and an older sister is extremely tall, with long arms and legs. The older sister, too, has a weakened aorta. All of these siblings have Marfan syndrome. Answer e. The B allele confers black coat color and the b allele brown coat color in Labrador dogs. When another gene, E, is inherited, the coat is golden no matter what the B phenotype is. A dog of genotype ee expresses the black phenotype. Answer

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LABORATORY EXERCISES IN GENETICS
b. Two couples are heterozygous for genes that cause albinism, but each gene
specifies a different enzyme in the biochemical pathway for skin pigment
synthesis. Their children, thus, do not face a 25% risk of having albinism.
Answer
C. Clara has severe neurofibromatosis type I. She has brown spots on her skin
and several large tumors beneath her skin. A gene test shows that her son
has inherited the disease-causing autosomal dominant allele, but he has no
symptoms.
Answer
d. Mateo, an apparently healthy 24-year-old basketball player, dies when his
aorta ruptures. A younger brother is nearsighted and has long and thin
fingers, and an older sister is extremely tall, with long arms and legs. The
older sister, too, has a weakened aorta. All of these siblings have Marfan
syndrome.
Answer
e. The B allele confers black coat color and the b allele brown coat color in
Labrador dogs. When another gene, E, is inherited, the coat is golden no
matter what the B phenotype is. A dog of genotype ee expresses the black
phenotype.
Answer
5. Connie Winslow is deaf. When she was old enough to attend school, she began
having fainting spells, especially when she became excited. Her parents took her
to a neurologist, who checked Connie's heart and diagnosed long-QT syndrome
with deafness also called Jervell and Lange-Nielsen syndrome. This is a şevere
form of inherited heartbeat irregularity that can be fatal. Seven different genes can
cause long-QT syndrome. The Winslows Visited a medical geneticist, who
discovered that each had a mild heartbeat irregularity that did not produce
symptoms. Connie's parents had normal hearing. Connie's younger brother Jim
was also hearing-impaired and suffered night terrors, but had so far not fainted
during the day. Like Connie, he had the full syndrome. Tina, still a baby, was also
tested, She did not have either form of the family's illness; her heartbeat was
normal.
Transcribed Image Text:LABORATORY EXERCISES IN GENETICS b. Two couples are heterozygous for genes that cause albinism, but each gene specifies a different enzyme in the biochemical pathway for skin pigment synthesis. Their children, thus, do not face a 25% risk of having albinism. Answer C. Clara has severe neurofibromatosis type I. She has brown spots on her skin and several large tumors beneath her skin. A gene test shows that her son has inherited the disease-causing autosomal dominant allele, but he has no symptoms. Answer d. Mateo, an apparently healthy 24-year-old basketball player, dies when his aorta ruptures. A younger brother is nearsighted and has long and thin fingers, and an older sister is extremely tall, with long arms and legs. The older sister, too, has a weakened aorta. All of these siblings have Marfan syndrome. Answer e. The B allele confers black coat color and the b allele brown coat color in Labrador dogs. When another gene, E, is inherited, the coat is golden no matter what the B phenotype is. A dog of genotype ee expresses the black phenotype. Answer 5. Connie Winslow is deaf. When she was old enough to attend school, she began having fainting spells, especially when she became excited. Her parents took her to a neurologist, who checked Connie's heart and diagnosed long-QT syndrome with deafness also called Jervell and Lange-Nielsen syndrome. This is a şevere form of inherited heartbeat irregularity that can be fatal. Seven different genes can cause long-QT syndrome. The Winslows Visited a medical geneticist, who discovered that each had a mild heartbeat irregularity that did not produce symptoms. Connie's parents had normal hearing. Connie's younger brother Jim was also hearing-impaired and suffered night terrors, but had so far not fainted during the day. Like Connie, he had the full syndrome. Tina, still a baby, was also tested, She did not have either form of the family's illness; her heartbeat was normal.
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