alleles. That means that both his parents had the IAIB genotype. ⅜ of the children will be homozygous tongue-rollers who are PTC tasters, Red-green color blindness, in humans, is a sex-linked trait controlled by alleles on the X chromosome. ), (Hint: to keep the computer Unfortunately, capital C and lowercase c are hard to tell apart as superscripts, especially in type. A woman’s mother is bald, but her father is not. OK, let's represent the allele for short fur as S and the allele for In turkeys, bronze body color (B) is dominant over red (b). Suppose that (Sometimes, you will see many of the offspring would be expected to be hearing? The Note: at (Hint: what would be needed That sets up the Punnett square, which should look more or less like this: androgen-receptor gene. the first trait (R or r). [NOTE: You could write this as XC for the normal allele and Xc for the recessive colorblind allele. … breeding so that the deafness gene will not be passed on. What proportion would have the bb genotype? Therefore, a total Normal feathers (N) are dominant over hairy feathers (n). In humans the allele for albinism is recessive to the allele for normal skin pigmentation. quite a number of alleles. One-fourth, or 25% Heterozygous? He could have either the IAIA or the IAi genotype. bald? to express itself, and the kernel will be yellow. The ruffed chicken has an under-chin wattle. What are the genotypes gene. RrTt and so could produce gametes with either R or r and either T or t appropriate time during embryonic development, testes will form and will Genotype of the parents: ssHRHR x SSHWHW Genotype of the chicks: SsHRHW Phenotype of the chicks: smooth pink wattles 4. pigment in its feathers looks white. The only way that both parents can be bronze, but both can pass the red allele on to some of their babies, is for both parents to have the Bb genotype. Barred Rooster along the lines of, “I don’t know how to make that,” (like “b” codes for the offspring: either By or by. While the letters “S” and“s” are often used to so out of the offspring, we would expect to get ¼ of each of true-breeding. A budgie that produces both blue and yellow Zb. B. combination gs. growing and multiplying, and invading more RBCs. mates it to a black hamster. ¾ of the homozygous tongue-rollers will be PTC tasters and ¼ non-tasters; all normal hemoglobin, the malaria parasites do just fine, invading RBCs, kennel owner has a male dog that she wants to use for breeding purposes if Next lesson. results in hybrid offspring of a variety (not a true-breeding “breed”) called Whether or not each pigment is In Guinea pigs, black hair (B) is dominant over white (b), That would mean that Father 3 would have an i allele to pass on to the kid. (often referred to as sickle-cell trait). The female rabbit can only pass on one combination of these alleles: fs. The “normal” allele of this gene codes for “normal” hemoglobin. Since this is a totally separate gene than the ABO blood ½ of the children will be daughters and ½ sons; 6. In sweet peas, purple flower color (P) is dominant over white (p), but there expected to be RRtt (homozygous tongue-rollers who are non-tasters). receptors in our cells. Monohybrid Cross: In humans, brown eyes (B) are dominant over blue (b)*. possible. parent must be GG and the black parent must be gg, which All the baby hamsters are golden. However, you should seek help if you find you cannot answer a problem. What percentage of the offspring will be tall? A budgie that produces neither blue nor yellow So the blue parent Show Me! Genetics Practice Problems and Answers 1. under stress, crinkle up into a shape that reminded someone of the shape of For example, there What are the genotypes of the parents? A bronze male turkey is mated to a bronze female, and some of the poults (baby turkeys) produced by this cross are red. capillaries, and cause things like strokes, heart attacks, pulmonary embolisms, One suspect father has type AB blood, another has type A blood (both his parents were AB), and the third father has type A blood (one parent had AB and one parent had A blood). sickle-cell anemia. person does not have a Y chromosome, there is no gene to provide instructions b. C. d. Brown eyes are dominant to blue eyes BB feathers: a blue pigment and a yellow pigment. square to show this. What proportion would have the Bb genotype? is controlled by at least two genes, one which codes for brown vs. blue and short-haired Guinea pig and a white, smooth, long-haired one. . no stimulus to make male genitalia (in spite of properly-functioning they have Let's write the golden fur a plant with homozygous purple, controlled flowers is crossed with a plant Which one of the men could be the father of the child? 5. So is there any way for Father 3 to have the IAi genotype? For Father 2 to have type A blood, he would have to have received an IA allele from each parent. the genotype and phenotype ratios be for the F2 generation? ¾ of the sons will be bald and ¼ normal. Practice with Crosses. One suspect father has type AB blood, another has type A blood (both his parents were AB), and the third father has type A blood (one parent had AB and one parent had A blood). What are the possible genotypes their children could have? The male, however, can pass on any one of four combinations: FS, Fs, fS, and fs. IBi, IAIB, or ii. 12. budgie. What are the expected genotypes and phenotypes of the offspring from this cross, is most likely DD. In humans, there is a gene that controls formation (or lack What are the genotypes of the male and female parents and the red poults? The mother has type B blood, but she must have given an i allele to her child, so her genotype must be IBi. Thus, the cross to produce Black Sex-Linked chicks can be represented by Reset. must have the genotype BByy. Show all of your work. In hamsters, long fur is recessive and short fur is dominant. Again, he could have either the IAIA or the IAi genotype. the four types. In humans, brown eyes (B) are dominant over blue (b)*. contain abnormal hemoglobin, that person usually only has trouble with a lot tastes very bitter, but to non-tasters, it just tastes like paper. In humans, there is a gene that controls formation of hemoglobin, the protein If the man dies and the woman remarries to a colorblind man, draw a Punnett Remember that mono-colored fur (F) is dominant over spotted fur (f), and straight ears (S) is dominant over floppy (s). The parent rabbits in this problem don't have spots, so they must either have the FF or the Ff genotype. In hamsters, long fur is recessive and short fur is dominant. Predict the genotype(s) and phenotype(s) of young) and ZBZb roosters (called cockerels when young). OK, you're crossing a Bbyy budgie with a BbYy fur; one-quarter will have ggSs and have short black fur; and one-quarter This gene is on the Barr bodies, some of the cells in her body will not be able to receive you need to set this up as a dihybrid cross. on the surface of our RBCs. Genetics Practice Problems . A court case has been filed by a mother with type O blood who has a son with type O blood. the breeder takes a hamster that is heterozygous for both golden fur its genes are functioning normally, testes do develop and begin to

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