Ch. 5 Extensions and Modification of Basic Principles Flashcards

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1
Q

If red is dominant and white is recessive and they are crossed, the offspring are pink

A

incomplete dominance

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2
Q

If red is dominant and white is recessive, and they are crossed, the offspring are red with white spots

A

codominance

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3
Q

Incomplete dominance phenotypic ratio of two heterozygotes

A

1:2:1

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4
Q

Individuals with the same genotype can have the phenotype or not have the phenotype

A

incomplete penetrance

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5
Q

Some people have the phenotype to a different degree (more vs less affected), but all are affected to some degree

A

variable expressivity

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6
Q

One of the genotypes will never be viable

A

lethal allele

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7
Q

When there are more than 2 alleles at a given locus

A

multiple alleles

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8
Q

True or False: blood type is an example of multiple alleles

A

True

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9
Q

This occurs when one gene masks the expression of another gene

A

epistasis

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10
Q

True or False: the hypostatic gene is the gene that may. be masked

A

True

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11
Q

True or False: the epistatic gene is the gene that does the masking

A

True

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12
Q

True or False: Epistasis is always a dihybrid

A

True

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13
Q

What is the phenotypic ratio for two complete heterozygotes in a dihybrid cross?

A

9:3:3:1

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14
Q

What is the phenotypic ratio for two complete heterozygotes in recessive epistasis?

A

9:3:4

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15
Q

What is the phenotypic ratio for two complete heterozygotes in dominant epistasis?

A

12:3:1

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16
Q

What is the phenotypic ration for two complete heterozygotes in duplicate recessive epistasis?

A

9:7

17
Q

What traits are dominant in males and recessive in females (or vice versa)?

A

sex-influenced traits

18
Q

What traits only appear. in females and never in males (or vice versa)?

A

sex-limited traits

19
Q

True or False: sex-influenced traits are on the sex-chromosomes

A

False

20
Q

True or False: sex-linked are on the sex chromosomes

A

True

21
Q

True or False: sex-limited traits are on the sex chromosomes

A

False

22
Q

The phenotype of the offspring is determined by the genotype of the mother

A

genetic maternal effect

23
Q

True or False: if a trait follows the genetic maternal effect, the father can affect the physical appearance of his grandchildren

A

True

24
Q

What type of allele is only expressed in certain temperatures

A

temperature-sensitive allele