1.Which of the following crosses would always result in offspring that only display the dominant phenotype?...
1.Which of the following crosses would always result in offspring that only display the dominant phenotype?
a.TT x tt
b.Tt x Tt
c.TT x TT
d.both TT x tt and TT x TT
2.What are alleles?
a.genes for different traits, such as hair color or eye color
b.alternative forms of a gene for a single trait, such as blue eyes or brown eyes
c.the locations of genes on a chromosome
d.recessive forms of a kind of characteristic carried by genes
3.Skin color in humans, caused by several genes at several loci, is an example of
a.multiple alleles at one locus
b.incomplete dominance
c.epistasis
d.pleiotropy
polygenic inheritance
Homework Answers
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1.Which of the following crosses would always result in
offspring that only display the dominant phenotype?...
What are alleles? Genes for different traits, such as hair color and eye color Alternative forms...
What are alleles? Genes for different traits, such as hair color and eye color Alternative forms of a gene for a single trait, such as blue eyes or brown eyes The locations of genes on a chromosome Recessive forms of a kind of characteristic carried by genes Dominant forms of a kind of characteristic carried by genes In order to have the additional information provided by the location of the centromere in chromosomes, the process of karyotyping uses a chemical...
Uption 4. The inheritance of hair and eye color is very complicated. Scientists have found approximately...
Uption 4. The inheritance of hair and eye color is very complicated. Scientists have found approximately 10-20 genes responsible for determining hair and eye color in humans (sheesh - I thought a dihybrid cross with 2 genes was bad...). Although many genes are involved in producing these phenotypes, it does seem that just a few genes play a major role in determining the color of our hair and eyes. The following is a simplified, but still somewhat realistic view of...
In humans, brown (B) eye color is dominant to blue (b) eye color and brown (H)...
In humans, brown (B) eye color is dominant to blue (b) eye color and brown (H) hair color is dominant to red (h) hair color. [Assume single-gene traits] Question: Two individuals, who are both heterozygous for eye and hair color, mate. Which of the following is a correct statement about the phenotype ratios expected for their offspring if the genes are unlinked? A) 9/16 will have brown eyes and red hair B) 9/16 will have blue eyes and red hair...
FORKED LINE PROBABILITY: You are analyzing three traits with the following offspring probabilities: Dominant Phenotype Recessive...
FORKED LINE PROBABILITY: You are analyzing three traits with the following offspring probabilities: Dominant Phenotype Recessive Phenotype Trait 1: Cystic fibrosis 90% Healthy 10% Diseased Trait 2: Eye color 60% Brown 40% Blue Trait 3: Blood Type 30% A , 20% B , 10% AB 40% O What Proportion of offspring are expected (assume independent traits): A) To be diseased w/ blue eyes + blood type A B) To display the dominant phenotype for at least two traits? C) To...
DIHYBRID CROSSES In all of the examples above we have only been concerned with one trait....
DIHYBRID CROSSES In all of the examples above we have only been concerned with one trait. It is possible, however, to track the inheritance of more than one trait at a time. When one is investigating the inheritance of two traits at once the cross is called a dihybrid cross. Strictly speaking, a dihybrid cross is one between two individuals that are heterozygous for two traits, meaning that they are hybrids in two senses. For example, in humans eye color...
1) The alternate forms of a gene for the same trait are known as -A)alleles. B)phenotypes....
1) The alternate forms of a gene for the same trait are known as -A)alleles. B)phenotypes. C)genotypes. D)codominants. E)incomplete dominants. 2) Mendel carried out most of his research with A)livestock -B)pea plants. C)guinea pigs. D)fruit flies. E)bacteria. 3) Which of the following is true according to Mendel's law of segregation? A)Each individual contains two alleles for each trait. B)Fertilization restores the presence of two alleles. C)Alleles separate from each other during gamete formation. D)Each gamete contains one copy of each...
Traits Symbol Dominant Phenotype od Dimples Your phenotype Your genotype $ 1. Facial dimples 2. Bent...
Traits Symbol Dominant Phenotype od Dimples Your phenotype Your genotype $ 1. Facial dimples 2. Bent little finger 3. Eye Color Bent little finger Brown eyes 4. Free ear lobe E, e F.f Hih Free ear lobe 5. Mid-digital hair Presence of hair 6. Hand clasping Left on top 7. Widow's peak Widow's peak Ww Tt 8. Tongue Rolling Tongue roll се Cleft in chin 9. Chin cleft 10. Hitchhiker's Thumb 11. Handedness Hi, Straight (180" RT Right 12. Finger...
In humans, brown (B) eye color is dominant to blue (b) eye color and brown (H)...
In humans, brown (B) eye color is dominant to blue (b) eye color and brown (H) hair color is dominant to red (h) hair color. [Assume single-gene traits] Of only the offspring that have brown eyes and brown hair (B_H_, where dash indicates that the individual could be either homozygous or heterozygous for the dominant allele), what proportion are expected to have a genotype that is heterozygous for one of the traits but homozygous for the other trait? A) 1/4...
multiple choice questions: 1- What fraction of the progeny will show a recessive phenotype for just...
multiple choice questions: 1- What fraction of the progeny will show a recessive phenotype for just one gene in a cross between AaBbCc x AaBbCc? A. 7/16 B. 9/64 C. ¼ D. 27/64 E. 26/64 2- Siblings share what percentage of their alleles? A. ½ B. ¼ C. 1/8 D. 1/10 E. 1/16 3- In a heterozygote, one allele conceals the presence of another. This is Mendel's: A. principle of segregation. B. principle of independent assortment. C. principle of dominance....
0% B)25% C) 50% D) 75% E) 100% Show Punnett square and explanation. If a red...
0% B)25% C) 50% D) 75% E) 100% Show Punnett square and explanation. If a red flowered plant is crossed with a white flowered one and the offspring produces pink flowers. What type of inheritance does this represent? sex linked B. multiple allele C incomplete dominance D. environmental effect E. partial inheritance 2) If a man and a woman of no rmad skin color have an albino child (aa) hat are the genotypes of the parents? A). AA and Aa...
Uption 4. The inheritance of hair and eye color is very complicated. Scientists have found approximately 10-20 genes responsible for determining hair and eye color in humans (sheesh - I thought a dihybrid cross with 2 genes was bad...). Although many genes are involved in producing these phenotypes, it does seem that just a few genes play a major role in determining the color of our hair and eyes. The following is a simplified, but still somewhat realistic view of...
DIHYBRID CROSSES In all of the examples above we have only been concerned with one trait. It is possible, however, to track the inheritance of more than one trait at a time. When one is investigating the inheritance of two traits at once the cross is called a dihybrid cross. Strictly speaking, a dihybrid cross is one between two individuals that are heterozygous for two traits, meaning that they are hybrids in two senses. For example, in humans eye color...
1) The alternate forms of a gene for the same trait are known as -A)alleles. B)phenotypes. C)genotypes. D)codominants. E)incomplete dominants. 2) Mendel carried out most of his research with A)livestock -B)pea plants. C)guinea pigs. D)fruit flies. E)bacteria. 3) Which of the following is true according to Mendel's law of segregation? A)Each individual contains two alleles for each trait. B)Fertilization restores the presence of two alleles. C)Alleles separate from each other during gamete formation. D)Each gamete contains one copy of each...
Traits Symbol Dominant Phenotype od Dimples Your phenotype Your genotype $ 1. Facial dimples 2. Bent little finger 3. Eye Color Bent little finger Brown eyes 4. Free ear lobe E, e F.f Hih Free ear lobe 5. Mid-digital hair Presence of hair 6. Hand clasping Left on top 7. Widow's peak Widow's peak Ww Tt 8. Tongue Rolling Tongue roll се Cleft in chin 9. Chin cleft 10. Hitchhiker's Thumb 11. Handedness Hi, Straight (180" RT Right 12. Finger...
0% B)25% C) 50% D) 75% E) 100% Show Punnett square and explanation. If a red flowered plant is crossed with a white flowered one and the offspring produces pink flowers. What type of inheritance does this represent? sex linked B. multiple allele C incomplete dominance D. environmental effect E. partial inheritance 2) If a man and a woman of no rmad skin color have an albino child (aa) hat are the genotypes of the parents? A). AA and Aa...
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