Consider three independently assorting autosomal genes in Drosophila: X, Y and Z. When crossed to a male of XXyyZz, what is the probability that a female of genotype XxYYZz will produce an offspring of genotype XXYyzz? A. 1/16 B. 1/2 C. 1/8 D. 1/4
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- Let us suppose that two long-winged flies were crossed and that 77 long-winged and 24 short-winged specimens were counted in the offspring. a. Will the short-winged character be dominant or recessive?B. What will the genotypes of the parents be?C. What is the observed genotype ratio?Imagine that you are performing a cross involving seed color in garden pea plants. What traits would you expect to observe in the F1 offspring if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. a. only yellow-green seeds b. only yellow seeds c. 1:1 yellow seeds:green seeds d. 1:3 green seeds:yellow seedsIn a cross between a homozygous red-eyed female fruit fly and a white-eyed male fruit fly, what is the expected outcome? a. all white-eyed male offspring b. all white-eyed female offspring c. all red-eyed offspring d. half white-eyed make offspring
- In currant moths, their Light color is sex-linked and recessive (d) to dark color (D). Question: What are the genotype and the phenotype of the parents if a certain cross yields ½ dark and ½ light colored females and all dark males? Take note that female moths are heterogametic.How can the order of three linked genes (A, B, and C) on the same chromosome be determined? A. Calculating the frequency of recombination between genes. B. Gene order cannot be determined by looking at the results of a cross. C. Look for parental phenotypes. D. Look for single-crossover phenotypes involving the wild-type and mutant alleles of genes A, B, and C.Assume for a moment that you are working in a genetics lab with the fruit fly Drosophila melanogaster, a model organism for genetic research. You want to determine whether a newly found Drosophila characteristic is dominant or recessive.a. Explain how you would construct such a cross, as well as the expected outcomes that would indicate dominance.b. Why would working with Drosophila be easier than working with humans?
- Fruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly. a. Draw the Punnett square. b. What is the genotyoe ratio of the offspring? c. What is the phenotype ratio of the offspring? d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)Suppose that in barley plants, the allele for tall stalks is dominant over short stalks and the allele for wide leaves is dominant over thin leaves. What would be the best way to determine the genotype of a barley plant with a tall stalk and wide leaves? Choose 1 answer: A.Perform a testcross with a barley plant that has a tall stalk and thin leaves. B.Perform a testcross with a known heterozygous barley plant . C. Perform a testcross with a barley plant that has a short stalk and thin leaves. D. Perform a testcross with a barley plant that has a tall stalk and wide leaves.Consider the pedigree below for a recessive autosomal trait caused by allele t. The dominant wild-type allele is represented by T. What is the genotype of individual 4 in generation II?
- A heterozygous individual is crossed with a homozygous recessive individual. a. Draw a Punnett square to represent this cross. b. What is the probability that an offspring will have a homozygous genotype? c. What is the probability that an offspring will have a dominant phenotype? d. What is the probability that three offspring will be produced that all carry the recessive allele but do not express the recessive phenotype?Dark chocolate is dominant to milk chocolate in a special species of chocolate bunnies. It is assumed that inheritance of this character follows the rules of Mendelian genetics. A homozygous milk chocolate bunny is crossed with a homozygous dark chocolate bunny. Which chocolate traits will the offspring express and in what ratio? A. 3 milk chocolate to 1 dark chocolate B. All the bunnies will be milk chocolate C. 1 dark chocolate bunny to 1 milk chocolate bunny D. All the bunnies will be dark chocolate E. 3 dark chocolate to 1 milk chocolateIn cats, long hair is recessive to short hair. A short-haired male is mated to a long-haired female. a) What are all possible genotypes of these two cats? b) What alleles will the gametes of each of these cats contain in their chromosomes?c) What will the kittens from all possible crosses between these two cats look like?d) Two cats are mated. One of the parent cats is long-haired. The litter which results contains two short-haired and three long-haired kittens. What length fur does the second parent have, and what is its genotype?Cats also have a locus (gene) for a character called agouti. In cats with agouti fur, pigment is unevenly distributed (see Fig. 1). The agouti allele is dominant to the allele for regular fur. A male cat who long haired and is heterozygous for agouti fur is crossed with a female who has regular, non-agouti fur and is homozygous for short fur. a) What are the genotypes of these cats? b) What are all of the possible allelic combinations in the gametes from each…