28. In humans, red-green color blindness is a sexlinked recessive trait. If a man and a woman produce a color-blind son, which of the following must be true? (A) The father is color-blind. (B) Both parents carry the allele for color blindness. (C) Neither parent carries the allele for color blindness. (D) The father carries the allele for color blindness. (E) The mother carries the allele for color blindness.
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- 26. In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. If the blue-eyed sheep are mated with each other, what percent of their offspring will most likely have brown eyes? (A) 0% (B) 25% (C) 50% (D) 75% (E) 100% 27. In peas the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seed color is dominant (Y) and the trait for green seed color is recessive (y). A cross between two plants results in 296 tall yellow plants and 104 tall green plants. Which of the following are most likely to be the genotypes of the parents? (A) TTYY x TTYY (в) тТуу х ТTYу (C) TtYy x TIYY (D) TtYy x TTYY (Е) TIYY X Tiyy 28. In humans, red-green color blindness is a sexlinked recessive trait. If a man and a woman produce a color-blind son, which of the following must be true? (A) The father is color-blind. (B) Both parents…26. In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. If the blue-eyed sheep are mated with each other, what percent of their offspring will most likely have brown eyes? (A) 0% (B) 25% (C) 50% (D) 75% (E) 100% 27. In peas the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seed color is dominant (Y) and the trait for green seed color is recessive (y). A cross between two plants results in 296 tall yellow plants and 104 tall green plants. Which of the following are most likely to be the genotypes of the parents? (A) TTYY x TTYY (в) TТуу х ТTYу (C) TtYy x TIYY (D) TtYy x TTYY (E) TIYY x Ttyy 28. In humans, red-green color blindness is a sexlinked recessive trait. If a man and a woman produce a color-blind son, which of the following must be true? (A) The father is color-blind. (B) Both parents…26. In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. If the blue-eyed sheep are mated with each other, what percent of their offspring will most likely have brown eyes? (A) 0% (B) 25% (С) 50% (D) 75% (E) 100% 27. In peas the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seed color is dominant (Y) and the trait for green seed color is recessive (y). A cross between two plants results in 296 tall yellow plants and 104 tall green plants. Which of the following are most likely to be the genotypes of the parents? (A) TTYY x TTYY (В) ТТуу х TТYу (C) TtYy x TtYy (D) TtYy x TTYY (E) TtYY x Ttyy 28. In humans, red-green color blindness is a sexlinked recessive trait. If a man and a woman produce a color-blind son, which of the following must be true? (A) The father is color-blind. (B) Both parents…
- (D) 1/6 (E) 1/64 26. In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. If the blue-cyed sheep are mated with each other, what percent of their offspring will most likely have brown eyes? (A) 0% (В) 25% (C) 50% (D) 75% (E) 100% 27. In peas the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seed color is dominant (Y) and the trait for green seed color is recessive (y). A cross between two plants results in 296 tall yellow plants and 104 tall green plants. Which of the following are most likely to be the genotypes of the parents? (A) TTYY x TTYY (В) Туу х ТТYу (C) TIYY x TIYy (D) TIYy x TTYY (E) TtYY x Ttyy 28. In humans, red-green color blindness is a sexlinked recessive trait. If a man and a woman produce a color-blind son, which of the following must be true? (A) The father is color-blind. (B)…1. In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. (a) Diagram this cross, showing the genotypes and phenotypes. (b) What will the offspring be like if two F2 white guinea pigs are mated?2 (a) The trait of hen- versus cock-feathering is a sex-limited trait controlled by a single gene. HH and Hh males always exhibit the hen-featuring trait. Only hh males show the cock-feathering trait. Starting with two heterozygous fowls that are hen- feathered, describe how you would obtain a true-breeding line that always produces cock-feathered males. [Ciri berhulu avam hatin
- făctőrs suc 19) The genotype of a black snake is unknown. Black is a dominant allele, so the snake could be either BB or Bb. You cross this snake with a white snake (bb). Which of the following results of that cross would support the unknown genotype of the black snake being a homozygote? A) All F1 offspring are white B) All F1 offspring are black C) Half of the F1 offspring are white, the other half are black D) Three-quarters of the F1 offspring are black, the other quarter are white В x bb the4.Two organisms, AABBCCDDEE and aabbccddee, are mated to produce an F1 that is self-fertilized. If the capital letters represent dominant, independently assorting alleles:(a) How many different genotypes will occur in the F2?(b) What proportion of the F2 genotypes will be recessive for all five loci?(c) Would you change your answers to (a) and/or (b) if the initial cross occurred between AAbbCCddee x aaBBccDDEE parents? (d) Would you change your answers to (a) and/or (b) if the initial cross occurred between AABBCCDDEE x aabbccddEE parents?5. In cattle, roan color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. When two roan cattle are crossed, the phenotypes of the offspring are found to be in the ratio of 1 red: 2 roan: 1 white. a) What cross could produce the highest percentage of roan cattle? b) How would one produce a herd of pure-breeding roan-color cattle? Explain
- 9. In some cats, the gene for tail length shows incomplete dominance. When a cat with a long tail is bred to a cat with no tall, the resulting offspring have short talls. For each of the following, predict the types of offspring that would result. a) A long tail cat bred to a cat with no tail: Genotypes Phenotypes b) A long tail cat bred to a short tail cat: Genetypes Phenotypes c) Two shor tail cats: Genotypes PhenatypesMendelian Genetics Punnett Square Question : In cattle, the hornless condition (H) is dominant to that for the possession of horns (h). a) A horned bull is mated to a hornless cow which is heterozygous . What kind of offspring are to be expected and in what ratio ? b) If the cow is then mated to a hornless bull which is also heterozygous, what is the chance that the first calf will have horns ? c) Assuming that the first calf has horns, what is the chance that the second calf will be hornless ?In guinea pigs, short hair (S) is dominant to long (s). Black fur (B) is dominant to albino (b). A female from a strain which is pure breeding for black fur and short hair is mated to a male from a strain pure breeding for the albino condition and long hair. (A). What will be the phenotypes of the F1? (B) If members of the F1 are mated among themselves, what percentage of offspring can be expected to be homozygous for both traits? Give the genotypes and phenotypes of these homozygotes.