Assignment #2 Genetics assignment for DNA class Spring 24

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Apr 3, 2024

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Name ______________________________ GENETICS ASSIGNMENT- SPRING ‘24 1. In certain flies, red eyes are dominant over white eyes. If a hybrid (heterozygous) red-eyed fly is crossed to a white- eyed fly …. A. Their offspring should have red eyes B. Some offspring should have red and some white eyes C. Their offspring should have only white eyes D. Some offspring should have pink eyes and some red eyes 2. In foxes, silver- black coat color is governed by a recessive allele “b” and red color by the dominant allele “B”. Determine the genotypic and phenotypic ratios expected from the following matings. Be sure to show your work and give the ratios for each mating. A. Pure breeding red fox crossed with a fox that is a carrier for the recessive allele B. Silver-black fox crossed with a pure breeding red fox 3. Matching genes on homologous chromosomes that control contrasting traits are called A. centromeres B. alleles C. genotypes D. phenotypes 4. If an individual is the result of the union of gametes carrying different alleles one would refer to that individual’s genotype as being ___________________________. 5. The normal cloven-footed (a hoof which is split into two toes) condition in swine is produced by the homozygous recessive genotype “mm”. A mule -footed condition is produced by the dominant gene “M”. White coat color is governed by the dominant allele “B” while the black coat color is governed by its recessive allele “b”. Suppose a white, mule-footed sow (female) is mated to a black, cloven-footed boar (male) and produces several litters. Of the 26 offspring produced from this mating, all were found to be white with mule feet. A. What is the most probable genotype of the sow? ______________________ B. The next litter produced 8 white, mule-footed offspring and 1 white, cloven-footed pig. Now, what is the most probable genotype of the sow? ____________________ 6. Color-blindness is a sex linked recessive trait. A. Is it possible that two normal parents could produce a girl with color-blindness? Yes or No? _________ B. A boy with color-blindness? Yes or No? ___________________ Explain each answer and support your reasoning with a Punnet Square(s).

7. The gene for absence of eyes in fruit flies is recessive and that for normal eyes is dominant. An eyeless male is crossed with a female who is purebred for normal eyes. They produce 100 offspring which are then bred with each other and produce 2000 offspring. A. How many of the 100 (F 1 ) are blind? ________________ B. How many of the 2000 (F 2 ) have normal vision? _______________ C. How many of the 100 (F 1 ) are heterozygous for normal vision? _______________ D. How many of the 2000 (F 2 ) are heterozygous for normal vision? ________________ Use the space below to show how you came up with the answers. Show your work using a Punnett Square(s). 8. Shown below is one pair of chromosomes from a female and male cat. Each carries 4 genes as shown. E s l c chromosome from egg of female cat e S l C chromosome from sperm of male cat Given the information below, describe what this kitten will look like ___________________ __________________________________________________________________________ (E) is dominant for electric green eyes and (e) is recessive for brown eyes (S) is dominant for silky hair and (s) is recessive for hairless (L) is dominant for long hair and (l) is recessive for straight hair (C) is dominant for calico color and (c) is recessive for solid color 9. A rare recessive allele inherited in a Mendelian manner, causes the disease Cystic Fibrosis. Suppose a man (Simon) who is phenotypically normal, and whose mother was normal but his father had cystic fibrosis, marries a woman (Jenny) who has Cystic Fibrosis. The parents of the woman are both normal. They are concerned that their children may inherit this disorder and decide to come to you, their genetic counselor. You begin by drawing a pedigree chart to show them the inheritance pattern in their family thus far. In the space below draw the pedigree chart which you would show them. Label the man, woman and each of their parents giving their possible genotypes.

10. In humans, black hair is dominant over red hair (B=black; b=red) and having six fingers is dominant over having five fingers (F=six fingers; f= five fingers). A. What are the possible genotypes of a black-haired six fingered individual? _______________________________________________________________________ _______________________________________________________________________ B. What is the genotype of a red-haired, five fingered individual? ___________________________________ C. Show the resulting (F 2 ) second generation of progeny (offspring) from an initial cross between a homozygous black haired, six fingered individual and homozygous red haired, five fingered individual. D. Be sure you read the question carefully. Show all of your work using Punnett Square(s) and be sure to give both the genotypic and phenotypic ratios showing all of the genotypes and phenotypes clearly in your answer.

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