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- In Andalusian fowls, black (BB) and white (bb) individuals are homozygous. When a homozygous black bird (BB) is crossed with a homozygous white (bb) bird offspring are all bluish-gray (Bb). Show the cross as well as the genotypes and phenotypes of the parental cross between two heterozygous parents. 1. P1: _________ x _________ 2. Punnett Square: 3. Genotype symbols: 4. Genotype in words: 5. Genotypic ratio: 6. Genotypic %: 7. Phenotype symbols: 8. Phenotype in words: 9. Phenotypic ratio: 10. Phenotypic %:In rabbits, the dominant allele B causes black fur and the recessive allele b causes brown fur; for an independently assorting gene, the dominant allele R causes long fur and the recessive allele r (for rex) causes short fur. A homozy-gous rabbit with long, black fur is crossed with a rabbit with short, brown fur, and the offspring are intercrossed. In the F2, what proportion of the rabbits with long, black fur will be homozygous for both genes? Is there a faster way to do this than to write every genotype out?In guinea pigs, black hair is dominant over white hair. If a homozygous black guinea pig (father) were crossed with a homozygous white guinea pig (mother), the first generation of offspring would be all black.Match the mother's and father's genotypes and phenotypes to their correct description. 1. mother's phenotype 2. father's phenotype 3. father's genotype 4. mother's genotype a. black b. HH c. white d. hh
- Parakeets can have white, blue, green or yellow feathers. Feather color in parakeets is determined by two different genes Y and B. YYBB, YYBb, YyBB, or YyBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white. A green parakeet with genotype YYBB is crossed with a white parakeet. Which of the following would be expected? green offspring yellow offspring blue offspring A and B A, B, and CIn fish, having two fins (F) is dominant over having one fin (f). Complete the punnett square to show a cross between a heterozygous two finned fish with a one finned fish. What are the genotype and phenotype possibilities?Spotting in horses is a dominant trait. Cross a homozygous spotted horse with a homozygous solid-colored horse. What are the genotypes and phenotypes of their offspring? Cross two of the offspring from the above cross. What are the genotypes and phenotypes or their offspring? Cross a heterozygous spotted horse with a solid-colored horse. What are the genotypes and phenotypes of their offspring?
- What does a Punnett square illustrate? A. The phenotypes of all offspring in a test cross. B. The genotypes of all possible offspring in a test cross. C. The phenotypes of all possible offspring in a test cross. D. The genotypes and phenotypes of all possible offspring in a test cross.Use a branch diagram to determine all the phenotypes and corresponding ratios that are expected to occur among the offspring of the following Mendelian cross; d d E e F f X D D e e Ff. Assume incomplete dominance for D, E and F. Hint: are phenotypes and genotypes the same or different in this case?In mice, short hair is dominant over long hair. If a heterozygous shorthaired male is crossed with a heterozygous female, what percentage of the offspring are predicted to have long hair? Group of answer choices
- For the mating AaBBDdGg x AabbDdGG, draw the monhybrid punnet squares, one for each of the four genes shown in the cross. Assume that all genes assort independently. What fraction of the offspring would have the phenotype A_B_D_G? What fraction of the offspring would have the phenotype aaB_ddG_?The presence of freckles is a dominant trait. Cross a homozygous freckled man with a homozygous nonfreckled woman. What are the genotypes and phenotypes of their offspring? a. Cross two of the offspring from the above cross (sorry about the incest). What are the genotypes and phenotypes or their offspring? b. Cross a heterozygous freckled man with a nonfreckled woman. What are the genotypes and phenotypes of their offspring?You are studying ear shape in dogs (with XY se x determination) and cross a true-breeding pointed-ear female to a true-breeding floppy-ear male and collect all pointy-ear male and female offspring. Your colleague suspects that the two phenotypes may be caused by alleles of one X-linked gene. What sort of cross would you do to determine whether this is an X-linked trait? Name it and describe it. What offspring phenotypic ratio would you expect in that cross if the green allele is a dominant X-linked allele? Make sure to label your ratio with all relevant phenotypes. How would the result of your cross (from A) be different if the trait is autosomal