Mendelian Genetics Exam 1 Questions And Answers Rated A+ New Update Assured Satisfaction

allele - variant form of a gene codominance - hetero shows both pheno from the two alleles complete dominance - hetero shows same pheno as homo Epigenetics - change in phenotype without changing genotype Father has blood type A. Mother has blood type B. Child has blood type O. What are the genotypes of the parents? - IAi and IBi Father has blood type B. Mother blood type O. Child has blood type O. What is the chance of them having another two children who both have the blood type O. - 1/4 gene - unit of inheritance genotype - allele combination heterozygous - 2 different alleles homozygous - both alleles are the same How can environment influence genes? - through epigenetics In horses, black (B) is dominant, chestnut (b) is recessive, trotting (T) is dominant, pacing (t) is recessive. If a homozygous black pacer is mated to a homozygous chestnut trotter, what will be the appearance of the F1 generation? - black trotterIn horses, black (B) is dominant, chestnut (b) is recessive, trotting (T) is dominant, pacing (t) is recessive. Over the next two years, two more offspring are produced from this F1 cross (BbTt). What's the chance one is a chestnut pacer and the other a black pacer (can happen in either order)? - 3/128 In horses, black (B) is dominant, chestnut (b) is recessive, trotting (T) is dominant, pacing (t) is recessive. Two of these F1 (BbTt) horses are mated and produce one offspring, what's the chance it is a chestnut trotter? - 3/16 In mice, black fur (B) is dominant, brown fur (b) is recessive, short tails (T) are dominant, long tails (t) are recessive. A cross was made between a black long tail and a brown short tail and the offspring were: 2 black short tail 3 black long tail 3 brown short tail 2 brown long tail What are the genotypes of the parents? - Bbtt and bbTt In mice, black fur (B) is dominant, brown fur (b) is recessive, short tails (T) are dominant, long tails (t) are recessive. From this cross: BbTt × BBtt, what will be the phenotypic ratio of the offspring? - Black short 1: Black long 1 In sheep, lustrous fleece (L) results from an allele that is dominant over an allele for normal fleece (l). A ewe (adult female) with lustrous fleece is mated with a ram (adult male) with normal fleece. The ewe then gives birth to a single lamb with normal fleece. A heterozygous ewe is mated with a heterozygous ram. They have two lambs, what is the chance they will both be lustrous? - 9/16 In sheep, lustrous fleece (L) results from an allele that is dominant over an allele for normal fleece (l). A ewe (adult female) with lustrous fleece is mated with a ram (adult male) with normal fleece. The ewe then gives birth to a single lamb with normal fleece. From the same mating, what is the chance they will have two lambs with the same phenotype? - 10/16 In sheep, lustrous fleece (L) results from an allele that is dominant over an allele for normal fleece (l). A ewe (adult female) with lustrous fleece is mated with a ram (adult male) with normal fleece. The ewethen gives birth to a single lamb with normal fleece. From this single offspring, is it possible to determine the genotypes of the two parents? If so, what are their genotypes? - yes, ll and Ll In the cross AaBbCc × AaBbCc, what is the probability of producing the genotype AABBCC? - 1/64 In tigers a recessive allele causes a white tiger, two phonetically normal tigers are mated and produce a white offspring. What percent of their offspring are expected to have normal pigmentation? - 75% In Tigers, a recessive allele causes a white tiger, two phonetically normal tigers are mated and produce a white offspring. If the parents had two tiger cubs, what is the chance the cubs will be either both white or both normal? - 10/16 In Tigers, a recessive allele causes a white tiger, two phonetically normal tigers are mated and produce a white offspring. If the parents had two tiger cubs, what is the chance they would have a normal and then a white cub? - 3/16 incomplete dominance - hetero shows blended pheno John and Martha are contemplating having children, but John's brother has galactosemia (an autosomal recessive disease) and Martha's great-grandmother also had galactosemia. What is the probability that John and Martha's first child will have galactosemia? - 1/24