Biol Smorgasbord Review 2 Key

Smorgasbord Review #2 NAME: Key Flower color in snapdragons can be red, white, or pink. Pink snapdragons occur when the genotype is heterozygous. Two pink snapdragons are crossed. What are the phenotypes of their offspring and in what proportion?   CR CW CR CRCR CRCW CW CRCW CWCW Phenotypes: 1 Red : 2 Pink : 1 White Coat color in cattle can be red, white, or roan (both red and white). If 2 roan cattle are crossed, what are the phenotypes of their offspring and in what proportion?   CR CW CR CRCR CRCW CW CRCW CWCW Phenotypes: 1 Red : 2 Roan : 1 White A rabbit breeder wants to get white-haired, red-eyed rabbits as possible. However, these are both recessive traits and the 2 parent rabbits have gray hair and black eyes. How many white-haired, red-eyed rabbits will result if both parents are heterozygous for both traits?   Hair color = G, Eye color = B GgBb x GgBb GB Gb gB gb GB GGBB GGBb GgBB GgBb Gb GGBb Ggbb GgBb ggbb gB GgBB GgBb ggBB ggBb gb GgBb ggbb ggBb ggbb 1/16 = white-haired, red-eyed Color-blindness is a sex-linked recessive disorder. If Don is not colorblind and his wife, Betty, is not colorblind, would it be possible for them to have children who are colorblind? Show the cross to prove it.   XB Xb XB XBXB XBXb XB XBXB XBXb No! Two people, one heterozygous for type A blood and one who is homozygous for type B blood have children. What is the phenotypic ratio?   IA i IB IAIB IBi IB IAIB IBi 2 Type AB : 2 Type B 6. The gene for colorblindness is carried on the X chromosome and is recessive. A man, whose father was colorblind, has a colorblind daughter. a.) is this man colorblind? Yes How do you know? The man must pass on the Allele For colorblindness Along with the mother b.) Where did he get his gene for colorblindness? his mother Chis father passed on his "Y" fathers of all colorblind girls be colorblind? c.) Must the women nees both of their "XChromosomes to carry Color blindness otherwise they may be Normat XBXB or A CARNIC Yes Why? 7. Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a homozygous horned cow. What will be the genotype and phenotype of the first generation? F Hh All hornless All Hybrids 8. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). If two erminette chickens were crossed, what is the probability that: a. They would have a black chick? 25% b. They would have a white chick? 25% B CW Parents: CBX CW C CCBCN cwew 9. In mice, the ability to run normally is a dominant trait. Mice with this trait are called running mice (R). The recessive trait causes mice to run in circles only. Mice with this trait are called waltzing mice (r). Hair color is also inherited in mice. Black hair (B) is dominant over brown hair (b). Cross a heterozygous running, heterozygous black mouse with a homozygous running, RrBb x RRbb what is the Phenotypre RAT10: Practice Pedigrees RB Rb RRBb Rb RRBS Rb RR6b RRbb B RrBb Brbb RrBb Rrbb & running Black : 8 running Brown RbRRBB RRbb RrBb Rrbb RbRRBb RRbb Rr Bb rb Rr bb Practice Pedigrees 10. Marfan syndrome a) How is this syndrome inherited? Passed on from a dominant allele on the chromosome b) Can you determine individual II-4’s genotype? Yes. Explain. Individual II-4 has the dominant allele from dad and the recessive allele from mom. Because mom only has 2 recessive copies. c) Individuals II-1 and II-2 are considering having another child. What is the probability that this child will have Marfan syndrome? 50%. Explain using a Punnett square. This is a dominant disorder so you only need one copy to have it. II-2 has a 50% chance of passing the allele onto her children.   11. Jason and Michelle Jason is a 12 year old boy with no history of familial hypercholesterolemia (which is an autosomal recessive disorder) in his family. He has dreams of marrying his 10 year old neighbor Michelle when they become older. Michelle’s mother and father are both affected by familial hypercholesterolemia, but she has been tested and she does not contain the familial hypercholesterolemia gene. Jason has just learned about genetics in school and wants to predict the health of their future children. He has always wanted 2 children (a boy and a girl). Draw a pedigree that includes every person mentioned in the story. Include a Punnett square of the Jason and Michelle.   Draw your pedigree of the 8 people below   I HH, Hh Hh, hh | | HH, Hh Hh, hh | | Hh, hh Hh, hh | | II II a) Write in the probable genotype below each circle and square on the pedigree above. b) What is the probability that a child in generation II will become affected by familial hypercholesterolemia? 50%   Джерела й пов’язаний контент