Genes & Alleles Flashcards

1
Q

What is a gene?

A

A gene is a segment of DNA that contains the instructions for making a specific protein or set of proteins.

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2
Q

What are alleles?

A

Alleles are different versions of a gene that determine specific traits.

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3
Q

Define dominant allele.

A

A dominant allele is an allele that expresses its trait even in the presence of a recessive allele.

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4
Q

Define recessive allele.

A

A recessive allele is an allele that only expresses its trait when two copies are present.

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5
Q

True or False: A dominant allele can mask the presence of a recessive allele.

A

True

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6
Q

What is the genotype of an organism?

A

The genotype is the genetic makeup of an organism, specifically the alleles it possesses.

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7
Q

What is the phenotype of an organism?

A

The phenotype is the observable characteristics or traits of an organism.

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8
Q

Fill in the blank: The allele for brown eyes (B) is _____ to the allele for blue eyes (b).

A

dominant

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9
Q

If an organism has the genotype Bb, what will be the phenotype?

A

The phenotype will be brown eyes, as the dominant allele masks the recessive allele.

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10
Q

What does homozygous mean?

A

Homozygous means having two identical alleles for a trait.

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11
Q

What does heterozygous mean?

A

Heterozygous means having two different alleles for a trait.

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12
Q

Which genotype represents a recessive trait?

A

The genotype ‘bb’ represents a recessive trait.

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13
Q

True or False: An organism with genotype AA is homozygous.

A

True

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14
Q

What is a Punnett square used for?

A

A Punnett square is used to predict the genotypes and phenotypes of offspring from a genetic cross.

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15
Q

If a brown-eyed (Bb) and a blue-eyed (bb) parent breed, what is the probability of having a brown-eyed child?

A

50%

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16
Q

What is the symbol for a dominant allele?

A

A dominant allele is typically represented by a capital letter.

17
Q

What is the symbol for a recessive allele?

A

A recessive allele is typically represented by a lowercase letter.

18
Q

Fill in the blank: In humans, the allele for attached earlobes (e) is _____ to the allele for free earlobes (E).

19
Q

What does it mean for a trait to be inherited?

A

It means that the trait is passed from parents to offspring through genes.

20
Q

True or False: All traits are determined by a single gene.

21
Q

What is an example of a trait that is controlled by multiple genes?

A

Height is an example of a trait controlled by multiple genes.

22
Q

What is the term for different forms of a gene located at the same position on homologous chromosomes?

23
Q

If two parents are both heterozygous (Aa), what are the possible genotypes of their offspring?

A

AA, Aa, Aa, aa

24
Q

True or False: A phenotype can be influenced by environmental factors.

25
Q

What type of inheritance pattern does blood type follow?

A

Codominance and multiple alleles.