Patterns of Inheritance & Variation Flashcards

1
Q

Define a gene

A

A sequence of bases on a DNA molecules that codes for a protein

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2
Q

Define a allele

A

Different versions of the same gene

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3
Q

Define a genotype

A

An organisms genetic make up

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4
Q

Define a phenotype

A

An organisms physical characteristics determined by its genotype

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5
Q

Define dominant

A

An allele that is always expressed in the phenotype

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6
Q

Define recessive

A

An allele that is only expressed when it is homozygous in the genotype

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7
Q

Define locus

A

the specific position of a gene on a chromosome

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8
Q

What is monohybrid inheritance?

A

The transmission of one gene from parents to their offspring

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9
Q

What is the F1 generation?

A

The offspring from individuals with homozygous dominant and homozygous recessive.

All offspring are heterozygous

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10
Q

What is the F2 generation?

A

The offspring from two heterozygous F1 individuals

offspring result in a 3:1 ration of dominant to recessive

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11
Q

What is codominance?

A

Two different alleles are equally expressed in the phenotype

Both alleles are shown in the phenotype

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12
Q

What is sex linkage?

A

Genes on the X and Y chromosomes are sex linked genes

X chromosome carries the majority of these genes

Recessive alleles on the X chromosome appear on the phenotype of males

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13
Q

What is Haemophilia?

A

An X-linked recessive disorder

Caused by a recessive X-linked allele

Alters DNA sequence coding for a blood clotting protein

Causing reduced blood clotting and excessive bleeding

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14
Q

Explain the inheritance of Haemophilia

A

It mainly affects males

Doesn’t often affect females

Always inherited from the mother in males

Mainly inherited form carrier mothers

Affected fathers can only pass it on to daughters

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15
Q

What is a dihybrid cross

A

The simultaneous inheritance of 2 genes controlling separate characteristics

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16
Q

What is true breeding?

A

Organisms that are homozygous for the trait being studied

17
Q

What is autosomal linkage?

A

Genes that are located on the same autosome are described as linked

Linked genes are inherited together in offspring

18
Q

How does crossing over affect autosomal linkage?

A

Crossing over can separate linked genes

However, when gens are linked, fewer recombinant offspring are produced

Less genetic variation being introduced from crossing over when genes are linked

19
Q

What is the chi-squared test used for?

A

To measure differences between observed experimental results and expected theoretical outcomes

20
Q

What is epistasis?

A

Interaction between genes where one gene masks the expression of another

21
Q

Explain recessive epistasis

A

One gene must be homozygous recessive to block the expression of another gene

22
Q

Explain dominant epistasis

A

One gene is dominant and actively modifies or blocks the expression of the other gene

23
Q

What is the Hardy-Weinberg principle?

A

An equating that calculates the frequency of alleles for a particular gene within a population

24
Q

What assumptions are made when using the Hardy-Weinberg principle?

A

No mutations occur

No migration into or out the population

Mating is random

Population size is large

No natural selection pressures

25
Q

What is the Hardy-Weinberg equation?

A

p^2 + 2pq + q^2