Genetics Homework

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Florida International University *

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3063

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Biology

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Feb 20, 2024

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Mission 1 1. In the land of Circusville, there are circus clowns that are showcasing their vibrant colors under the magical Big Top. The clown color coat is determined by an autosomal gene with two spellbinding alleles. "S" for striped coats and "s" for star coats. If a striped clown (S, s) and a star clown (s, s) decide to start a family, what percentage (%) of their baby Circus Clowns will have striped coats AND be daring little clown boys? a. 50% b. 25% c. 75% d. 100% 2. In the world of Clownsville, the nose color of circus clowns is determined by a singular gene with two captivating alleles: "B" for bright red (dominant) and "b" for blazing black; (recessive). A thorough gene test of 100 circus clowns reveals that 30 clowns have a nose that is homozygous red (BB), 60 clowns have a nose that is heterozygous red (Bb), and 20 clowns have a nose that is homozygous recessive black (bb). Let's step into the colorful realm and determine the Chi-square, assuming the original clown parents were a dynamic pair, one with a bright red nose (B) and the other with a sunny yellow nose (b). Hint: Determine the expected values first before plugging into the equation and round to the nearest whole number. a. 1 b. 2 c. 3 d. 4 3. In a circus, there's a genetic trait for acrobatic skill determined by a pair of alleles: A (acrobatic) and a (non-acrobatic). Two acrobats with genotypes Aa and Aa decide to have children. What is the expected phenotypic ratio among their o±spring? a. 2:1 b. 9:3 c. 3:1 d. 1:1
4. The trait of a clown's red nose is recessive (r) to the trait of a brown nose (R). What is the probability that two clowns, one with a red nose and one heterozygous for a brown nose will have 7 clown kids, 5 with brown nose and 3 with red nose? a. 0.25 b. 0.27 c. 0.30 d. 0.35
Mission 2 1. A funambulist is a carrier of an X-linked recessive gene. She is known for having hemophilia. She has a partner who is also a furambulist, and he is completely healthy. If they were to have a daughter and a son. what is the probability for the son to have hemophilia? a. 50% b. 25% c. 0% 2. Michael is a clown that has a trait of Fragile X syndrome, and it a±ects both males and females. However, it is an X-linked condition. If Michael mates with Emely the funambulist, who happens to have the same syndrome? What is the probability that one of their sons and daughters inherits the syndrome from Michael the Clown? a. 0% son & 100% daughter b. 0% son & 50% daughter c. 50% son & 100% daughter 3. In a group of clowns, some are colorblind, there are female red-nosed clowns and male blue-nosed clowns. The red-nosed clowns have a gene for colorblindness on their X chromosome. If a colorblind, red-nosed clowvn mates with a blue-nosed clown who is not colorblind, what is the probability that their son will be colorblind? a. 25% b. 75% c. 50% 4. Eric the clown has hypertrichosis of the ear which is an example of a Y chromosome sex-linked syndrome. What is the possibility of Eric having a baby boy clown with the syndrome? a. 50% b. 100% c. 0%
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Mission 3 1. "In a clown population where the trait for oversized shoes follows incomplete dominance, the allele for giant shoes (G) is incompletely dominant over the allele for tiny shoes (g). If two clowns with heterozygous genotypes (Gg) for shoe size mate, what will be the possible phenotypes and their respective ratios among their o±spring?" a. 1:2:1 Incomplete Dominance b. 2:1:1 Complete Dominance c. 2:1:1 Incomplete Dominance 2. A juggler wants to find the probability of having a left-handed child. Considering that the trait of being left-handed is recessive the juggler and his wife are heterozygous and are left-handed. The penetrance for the autosomal trait is 25%. a. 0.125 b. 0.375 c. 0.25 3. In a circus troupe, the trait for juggling ability influences the trait for balance on a unicycle. Mastering the art of juggling (J) is dominant to the lack of juggling skills (j), while having a good sense of balance on a unicycle (U) is recessive to a wobbly sense of balance (u). Interestingly, if a circus performer possesses the lack of juggling skills, they automatically struggle with maintaining balance on a unicycle. Calculate the phenotypic frequency of a performer with no juggling skills and a wobbly sense of balance if two Master Juggler steady unicyclists (Jj, Uu x Jj, Uu) are the parents. a. ⅙ b. ¾ c. ¼ 4. In the circus of clowns, Aura is embarking on a paternity quest to identify her possible clown dad. Relying solely on circus gossip, she has no access to the genotypes of the potential fathers. Aura is certain that her clown blood is type A, sporting the genotype (A^I A*i). Three fathers can be potentially her father which is type O, type A,
and type AB Who among these colorful clowns could potentially be Aura's clown father? a. Type A b. Type A & Type O c. Type O d. Type B

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