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Exam 23: Patterns of Gene Inheritance

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Question 31

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Computer simulations are sometimes used to demonstrate the outcome of monohybrid fruit fly crosses,where a student can run generation after generation of fruit flies with 100 offspring produced each generation,half male and half female,and a 3-to-1 phenotype ratio (or 75 to 25) in the F₁ generation.Compared to real genetics results,which of the following is NOT true?

A) Rarely would exactly 100 fly offspring be produced or survive.
B) An exact balance between males and females would be rare.
C) A precise 3-to-1 ratio would be uncommon.
D) It is usually possible to have exactly 100 offspring,half male and half female,and a 3-to-1 phenotypic outcome in real life.
E) Ratios and outcomes will not be exact but will be very close to the expected numbers.

F) D) and E)
G) B) and E)

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Question 32

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The leaves of a maple tree vary in size depending on the location of the leaves on the tree.Those growing at the outer region of the tree tend to be smaller than those growing closer to the trunk of the tree.This allows leaves that are growing in the shade to have a larger surface area.This show that genes have the ability to

A) respond to environmental factors.
B) show two different genetic variations.
C) be turned off if they are not needed.
D) choose whether or not they are expressed.
E) mutated by exposure to sunlight.

F) A) and E)
G) A) and D)

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Question 33

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In humans,widow's peak (W) is dominant over straight hairline (w) .If a heterozygous male marries a female with a straight hairline,what percent of their children can be expected to have widow's peak?

Hydrangeas are a flowering plant with large showy blooms.When a plant is grown in aluminum-rich soil it has blue flowers.If the same plant is transplanted into soil that is lacking aluminum,the flowers produced will be pink.This is an example of

What are the chances that two individuals with wavy hair (an incomplete trait) will have a curly-haired child? Curly hair and straight hair exhibit incomplete dominance.

A woman who can roll her tongue (presumably dominant) is married to a man who cannot.Two of their four children can roll their tongues and two cannot.If A = roll tongue and a = cannot roll tongue,then what is the genotype of the parents?

In pea plants,the gene for round seed (R) is dominant,and wrinkled seeds (r) are recessive.The endosperm of the pea is also either starchy,a dominant gene (S) ,or waxy (s) .What CANNOT be said of a cross between two parents that are heterozygous for both traits?

Which genetic disorder is associated with a defect in the elastic connective tissue protein called fibrillin?

In humans,assume red hair is recessive to dark hair.What are the chances of a dark-haired couple having a red-haired child if each had a red-haired parent?

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

In which kind of cross could you expect to find ratios of 1:1:1:1 among the offspring?

A blue-eyed,left-handed woman marries a brown-eyed,right-handed man who is heterozygous for both of his traits.If blue eyes and left-handedness are recessive,how many different phenotypes are possible in their children?

Cold weather can change the ______ of a Himalayan rabbit.

A man with a widow's peak (dominant) and can curl his tongue (dominant) has a child who has a continuous hairline and cannot curl the tongue.What is the genotype of the father?

What will the genotypic ratio be of a monohybrid cross of two individuals who are both heterozygous for a trait?

The inheritance of blood types in humans can be explained by

A pheasant breeder starts with two birds in the P generation,one of which is AA and the other is aa.If he takes two of the birds from the F₁ generation and breeds them together,what can he expect in his F₂ offspring?

If the probability of event A is 3/4 and the probability of event B is 1/4,then the probability of both A and B occurring at the same time is

Since each child of two heterozygous parents has a 1/4 chance of receiving a recessive trait from each parent,

If an individual with a dominant phenotype is crossed with an individual with a recessive phenotype,4 of their 9 offspring show the recessive phenotype.What is the genotype of the dominant parent?