Which genotypic ratio is observed among the F2 offspring of two double heterozygotes? All recessive 1:2:1:2:4:2:1:2:1 All dominant O9:3:3:1 1:2:1 O 3:1 O 1:1
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- All of the following statements aboutinheritance are true, except one. Which one of the following statements is INCORRECT ? O All genes have two alleles: one dominant and one recessive. Some phenotypes arise from the interaction of more than one gene. O Incomplete dominance is when heterozygotes express a phenotype that appears to be a blend between the phenotypes of homozygotes. O Even If you know the genotypes of both parents, you cannot always know with certainty the genotype their child will have.Achondroplasia is the most common form of dwarfism in miniature horses. Achondroplasia dwarf horses have normal sized bodies and heads, but noticeably smaller upper legs and ears. This form of dwarfism is an autosomal dominant trait. The pedigree shows the offspring of one horse without dwarfism, Individual 1, and one with dwarfism, Individual 2. The horses with achondroplasia are shorter. 1 2A woman who has normal vision and is heterozygous for colour blindness has children with a man who is colour blind. What is the expected ratio of genotypes among their children? X° X° :X° X° : X° Y: X° y 1 : 1: 1 : 1 xC xC :X° Y : XC Y : 1: 2 : 1 XC x° : XC Y : XC Y 1: 1 XC xC :XC x° : XC Y 1: 1 : 2
- In the following pedigree of an autosomal recessive trait, which individuals in generation III cannot be carriers? I 1 2 || 2 III 1 2 none of them can be carriers individuals III-3 and III-4 they can all potentially be carriers not enough information to determine individuals III-1 and III-2 1 3 3 4 4 5ABO blood group is co-dominant for AB and O is recessive. Rh (+/-) factor is completely dominant. A man with O/positive blood and a woman with A/negative blood have six children. All of their children have A + blood type. What can you conclude about the parents’ genotypes? Group of answer choices Both mother and father are likely homozygous at both loci Mother was homozygous at the ABO locus but heterozygous at the Rh factor locus Father was homozygous at the ABO locus but heterozygous at the Rh factor locus Mother was heterozygous at both lociIn some plants, purple flower color is dominant to white flower color. If a plant that is homozygous dominant for purple flowercolor is crossed witha plant that h as homozygous recessive, what percentage of the offsprings will have white flowers? 1) 0% 2) 50% 3) 25% 4) 100%
- Could the trait presented in the pedigree shown be caused by an X-linked recessive allele? Why or why not? 11 ||| IV ■ 5 6 Yes, with individual 2 of generation I being heterozygous. No, the offspring of 7 and 8 contradict an X-linked recessive inheritance. No, the offspring of 3 and 4 of generation II contradict an X-linked recessive inheritance. No, the offspring of 1 and 2 of generation I contradict an X-linked recessive inheritance.One type of colorblindness is an X-linked recessive trait. If a colorblind man and a woman with normal vision but whose father was colorblind have a girl, what is the probability she will be colorblind? If they have a boy what is the probability he will be colorblind? 1/2 for the girl; 1/4 for the boy O 1/2 for the girl; 100% for the boy O 1/2 for the girl; 1/2 for the boy 1/4 for the girl; 1/2 for the boy O for the girl; 1/2 for the boyAll of the cats who reside at the Ernest Hemingway Museum in Key West, Florida, carry at least one dominant allele for polydactyly. However, only about half the cats display an extra toe on their paws; the others have the expected number of toes. Which of the following is a possible explanation for this? Variable expressivity Variable penetrance O Cytoplasmic inheritance O Incomplete dominance Question 6 A gene that controls more than one trait is (Be sure to check your spelling on this one.)
- 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 PTTGG ttgg F1 TG tg F2 TtGg Which types of genotypes are represented in F1 and F2 in the above figure, respectively? heterozygous and heterozygous heterozygous and homozygous homozygous and heterozygous homozygous and homozygousMendelian Genetics Worksheet Name Hour Fill in the Punnett squares for each cross given to determine the phenotype and genotype ratio's of the offspring Crosses with one homozygous dominant parent: AA x AA A AA x Aa A АА х а A AA x aa A A A A A a A a a Offspring Genotypes: AA AA AA Aa Offspring Phenotypes: Aa Aa aa aa aa Dominant Dominant Recessive Dominant Recessive Recessive_ _ Crosses with one heterozygous parent: Aа х АА Аа х Аа Аа х аа A a A a A a A a A a a Offspring Genotypes: AA_ Aa_ aa AA Aa aa AA_ Aa aa Offspring Phenotypes: Dominant Recessive Dominant Dominant Recessive Recessive _ Crosses with one homozygous recessive parent: aa x AA aa x Aa аа х аа a a a a a a A A a A a a Offspring Genotypes: AA Aa_aa AALAA_aa AA Aa_ aa_ Offspring Phenotypes: Dominant Dominant Dominant Recessive_ Recessive_ Recessive _