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Exam 9: Patterns of Inheritance

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Question 1

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Attached earlobes are recessive to free earlobes.What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

A) 2:1
B) 1:1
C) 1:2:1
D) 3:1

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Question 2

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Alleles are described as ________.

A) homologous chromosomes
B) environmental factors that affect gene expression
C) alternate versions of a gene
D) alternate phenotypes

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Question 3

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Please refer to the following art to answer the following questions. -Recombinant offspring were produced by the mating shown in the accompanying art.What is the recombination frequency of purple round and red long offspring?

A dihybrid cross produces 30 recombinant offspring out of a total of 1,000 offspring.What is the recombination frequency of the two gene pairs?

What name is given to the specific location of a gene on a chromosome?

Achondroplasia is a form of dwarfism caused by a dominant allele.The homozygous dominant genotype causes death,so individuals who have this condition are all heterozygotes.If a person with achondroplasia mates with a person who does not have achondroplasia,what percentage of their children would be expected to have achondroplasia?

What is the basis of Mendel's laws?

What is key to recognition of a trait whose expression is determined by the effects of two or more genes (polygenic inheritance) ?

Experience with dog breeding has taught geneticists ________.

This hypothetical pedigree for a disease in humans illustrated inheritance that is

An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair.If an individual with wavy hair mates with an individual with straight hair,what is the probability that their child will have curly hair?

Assume that having three nostrils is inherited as a sex-linked trait on the Y chromosome.A man with three nostrils has a daughter who has a son with a man who has only two nostrils.What is the probability that the three-nostriled man's grandson has three nostrils?

What is the key to the recognition of codominance?

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The seeds of all of the offspring are yellow.Why?

Red-green color blindness is inherited as a sex-linked recessive trait.The gene is found on the X chromosome.Can a man with normal color vision father a daughter who is red-green color-blind?

This pedigree supports the fact that widow's peak is due to a dominant allele,because if it were due to a recessive allele and both parents show the recessive phenotype,then ________.

An individual with the blood group genotype Lᴹᴸᴺ has the phenotype MN.What is the relationship between the Lᴹ and Lᴺ alleles?

Marfan syndrome is the result of inheriting a single allele.Individuals with Marfan syndrome are tall and long-limbed,and have both cardiovascular and eye defects.Of what type of inheritance is the phenotype of Marfan syndrome an example?

Please refer to the following art to answer the following questions. -In the accompanying art,you see a table with the actual number of offspring that resulted from a dihybrid cross.The numbers do not show the 9:3:3:1 ratio predicted.One phenotype occurred more than predicted; another occurred less.The reason could be because ________.

The recombination frequency between gene B and gene C is 11%.The recombination frequency between gene B and gene D is 5%.The recombination frequency between gene C and gene D is 15%.What would be the arrangement of these genes on a linkage map?