Exam 3: Mendelian Genetics

The phenotype of vestigial short)wings vg in Drosophila melanogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy h)body.Assume that a cross is made between a fly with normal wings and a hairy body and a fly with vestigial wings and normal body hair.The wild- type F1 flies were crossed among each other to produce 1024 offspring.Which phenotypes would you expect among the 1024 offspring,and how many of each phenotype would you expect?

Which types of phenotypic ratios are likely to occur in crosses when dealing with two gene pairs for which all the genotypic combinations are of equal viability?

A recessive allele in dogs causes white spots.If two solid colored dogs are mated and produce a spotted offspring,what is the percentage chance their next puppy would be solid colored?

The process that leads to development haploid gamete is best described as__________ .

Two organisms,AABBCCDDEE and aabbccddee,are mated to produce an F1 that is self- fertilized.If the capital letters represent dominant,independently assorting alleles.What proportion of the F2 genotypes will be recessive for all five loci?

The number of possible gametes,each with different chromosome compositions,is 2n,where n equals __________.

Which of the following best describes the relationship at the molecular level between mutant alleles and phenotype?

Polydactyly is expressed when an individual has extra fingers and/or toes.Assume that a man with six fingers on each hand and six toes on each foot marries a woman with a normal number of digits.Having extra digits is caused by a dominant allele.The couple has a son with normal hands and feet,but the couple's second child has extra digits.What is the probability that their next child will have polydactyly?

How many kinds of gametes will be expected from an individual with the genotype PpCcTTRr?

Albinism,lack of pigmentation in humans,results from an autosomal recessive gene.Two parents with normal pigmentation have an albino child.What is the probability that their next child will be albino?

The autosomal not X- linked)gene for brachydactyly,short fingers,is dominant to normal finger length.Assume that a female with brachydactyly in the heterozygous condition is married to a man with normal fingers.What is the probability that their first child will have brachydactyly?

The autosomal not X- linked gene for brachydactyly,short fingers,is dominant to normal finger length.Assume that a female with brachydactyly in the heterozygous condition is married to a man with normal fingers.What is the probability that their first two children will have brachydactyly?

A certain type of congenital deafness in humans is caused by a rare autosomal recessive gene.In a mating involving a deaf man and a deaf woman,could some of the children have normal hearing?

Assuming no crossing over between the gene in question and the centromere,when do alleles segregate during meiosis?

To test Mendel's Law of Segregation,the experimenter needs__________ .

Albinism,lack of pigmentation in humans,results from an autosomal recessive gene.Two parents with normal pigmentation have an albino child.What is the probability that their next child will be wild type?

Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring.When the albino was crossed with a second black guinea pig,4 black and 3 albino offspring were produced.What genetic explanation would apply to these data?

Dentinogenesis imperfecta is a rare,autosomal,dominantly inherited disease of the teeth that occurs in about one in 8000 people.The teeth are somewhat brown in color,and the crowns wear down rapidly.Assume that a male with dentinogenesis imperfecta and no family history of the disease marries a woman with normal teeth.What is the probability that their first child will have dentinogenesis imperfecta?

In a Chi- square test,as the value of the ç² increases,the likelihood of rejecting the null hypothesis__________ .

For which of the following questions would you use the sum law?