7. If an organism that is homozygous recessive for a trait is crossed with a heterozygote, what is the chance of getting a homozygous recessive phenotype in the first generation? A. B. C. D. 0% 25% 50% 100%
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- 3. Beetles of a certain species may have green, blue, or turquoise wing covers. Virgin beetles were selected from a polymorphic (i.e. not a true-breeding stock) laboratory population and mated to determine the inheritance of wing-cover color. The crosses and results were as follows: Parents blue X green blue X blue 1 2 3 4 5 6 7 8 green X green blue X turquoise blue X blue a. blue X green blue X green turquoise X turquoise Progeny all blue 3 blue: 1 turquoise 3 green 1 turquoise 1 blue: 1 turquoise 3 blue: 1 green 1 blue: 1 green 2 blue 1 green: 1 turquoise all turquoise Explain how the genetic basis of wing-cover color in this species could be determined by one gene. b. Write the genotypes of all parents and progeny as completely as possible. (Use gene and allele symbols of your own choosing, but please define what they are.)18. The following question refers to the pedigree chart in the figure below for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. What is the likelihood that the progeny of IV-3 and IV-4 will have the trait? (LS3-3) * 1 2 I WW Ww 2 3 4 16 17 8 II III 1 2 3 IV 0% 50% 75% 100%19. If you cross a homozygous dominant individual with a heterozygous individual, what percentage of the offspring would display the dominant phenotype? 1. 0% 2. 25% 3. 50% 4. 75% 5. 100%
- Two pairs of traits are segregating in a cross. Two parents produce 156 progeny that fall into 4 phenotypes. The numbers of offspring in the 4 phenotypes are 89, 31, 28, and 8. What are the genotypes of the two parents?A. Part 1: F1 Generation Yellow Sampaguita- Homozygous recessive (cc) White Sampaguita- Homozygous dominant (CC) a. With the given sampaguita flowers, you will be crossing these two samples and identify the offspring using a punnet square. Indicate the ratio between each offspring B. Part 2: F2 generation a. With the results you have from Part 1 and using a punnet square, what are the offspring of your heterozygous parents to identify the F2 generation. Indicate the ratio between each offspring. Note: Please provide the punnet square and a detailed explanation1. Use the below pedigree chart to answer the following questions about dimples. The Dimple gene controls whether a person has dimples or doesn't have dimples. Dimples is dominant to no dimples. Place the genotypes of each individual below its symbol. male female 6 7 8 10 11 male female Dimples gene (D) Dimples is dominant to no dimples 12 13 14 May 2 ||: 59 A) How many family members have Dimples? B) What is the genotype of individual #3 and 4? C) Can either individual #8 or 9 be homozygous? C) Explain the family relationship that #12 has with # 2.
- Part B 1. For the remaining characteristics, you will be looking at homozygous and heterozygous traits. Each trait will be determined to be homozygous recessive, homozygous dominant, or hetero- zygous. Letters representing the alleles will be given to you; the uppercase letter is always dominant and the lowercase letter is always recessive. If both dice rolled are even numbers, it indicates homozygous dominant alleles; if both are odd, it indicates homozygous recessive alleles; if one is odd and the other even, it indicates heterozygous alleles. 2. Eyebrows: Use the alleles "A" and "a" for this trait. Two separate brows are the dominant trait, whereas the unibrow (or one continuous brow) is recessive. 3. Eye shape: Use the alleles "R" and "r" for this trait. Round eyes are the dominant trait; almond shaped eyes are recessive. 4. Hitchhiker's thumb: Use the alleles "H" and "h" for this trait. Straight thumbs are dominant; Hitchhiker's thumbs (the curving upward of the thumb) are…2 11 4 points Suppose we have a true breeding parental cross for a disease with an autosomal dominant mode of inheritance. Further, the cross is between a parent with an DD genotype and a parent with a dd genotype, where D = dominant allele, d = recessive allele. How many phenotype classes will be observed in the F₁ population? 1 0 (all offspring will die). 4 3 2 12 4 points 5 B 8 9 P1 pts The pedigree below shows the expression of Huntington's disease in a family. Huntington's disease is a fatal genetic disorder that causes the progressive breakdown of nerve cells in the brain. It deteriorates a person's physical and mental abilities usually during their prime working years and has no cure. Huntington's is inherited as a dominant allele (H). Examine the pedigree below and determine the genotype for individual "2" DODO0O 2. O HH O Hh О h O either HH or Hh
- 1. If a man, dominant homozygote for tongue rolling, is expecting a child with a woman that is heterozygotic for the trait – what is the probability for their firstborn to be a daughter being dominant homozygotic for tongue rolling? 2. A color-blind female is expecting with a color seeing male – what is the probability of a male child to see color? 3. In Sweden 1/500 are born with an autosomal recessive disorder called thalassemia. What is the carrier frequency within the population?1. How many different types of gametes can be produced by an individual with the genotype Yy Ww Pp ee Bb? 2. If an individual with the genotype Yy Ww Pp ee Bb is crossed with another individual with the same genotype, what proportion of offspring will be homozygous recessive at all genes? 3. If an individual with genotype Yy Ww Pp ee Bb is crossed with an individual with the same genotype, what proportion of offspring will have the dominant phenotype for the four heterozygous loci?1. If one parent is homozygous dominant for a trait, that parent's genotype might be GG. If the other parent is homozygous recessive for the same trait, that parent's genotype would be gg. What are the possible genotypes of their offspring? b. How many different phenotypes might we possibly see in their offspring? 2. If a male is homozygous dominant for a trait, that parent's genotype might be DD. If the female is heterozygous for the same trait, her genotype would be Dd. a. How many genetically different sperm can the male produce? b. Using a Punnett square, determine the expected genotypic ratios of their offspring. What are the expected phenotypic ratios? 3. In garden peas, the gene for red flowers (R) is dominant over the gene for white flowers (r). If pollen (cells containing sperm nuclei) from the anther (male reproductive organ) of a homozygous red-flowered plant is added to the pistil (female reproductive organ containing the egg) of a white- flowered plant: a. c. What would be…