What are the genotypes of the offspring and the ratio? _____ What are the phenot

Question

What are the genotypes of the offspring and the ratio? _____ What are the phenotypes and the ratio? _____ If a cross produces bandicoot offspring in a ratio of 3 brown:1 cream what were the genotypes of the parents? Male _____ Female _____ A brown eared bandicoot (BR) is crossed with a cream cared one. What percentage of the offspring will have brown cars? _____ A brown eared bandicoot that is a heterozygote is crossed with a cream eared one. What percentage of the offspring will have cream ears? _____ In humans, freckles are a dominant trait. Suppose Grant (who has freckles) marries J Lo (who lacks freckles). Grant and J Lo each have 1 parent with freckles and one without. Use F to represent the dominant allele for freckling, and f for the recessive allele. Use the Punnett square to determine genotypes of the offspring a. What is Grant's genotype? _____ J Lo's genotype? _____ b. What are the genotypes of the gametes Grant produces? _____, _____ J Lo? c. If J Lo's father is Ff, what genotype is her mother? _____ d. If Grant's mother is ff, what are the possible genotypes of his father? _____ e. What are the offspring's genotypes and their ratio? _____ f. What are the phenotypes and the phenotypic ratio? _____ Mendel developed true breeding lines in peas: Yellow colored seeds (Y) are dominant to green (y) seeds. Round (R) seeds are dominant to wrinkled (r) seeds. Tall plants (T) are dominant to dwarf plants (t). Assume these genes are located on separate chromosomes.

Explanation / Answer

Answer:

6. a. Grant (who has freckles) is heterozygous (Ff) for the trait since one of his parents had freckles (FF/Ff) and the other did not (ff).

J Lo's genotype is ff (with freckles).

b. Gametes:

Grant: F, f

J Lo: f, f

c. J Lo's father is Ff (freckles). So, J Lo's mother is ff (without freckles).

d. If Grant's mother is ff (without freckles), his father is either FF or Ff.

e. Genotype of the offsprings: Ff, ff in the ratio 1:1.

f. The phenotypes of the offsprings are: Freckles (Ff) and without freckles (ff) in the ratio 1:1.

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