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Biology 30 > 17.2 > Flashcards

17.2 Flashcards

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1
Q

What organism did Morgan need to collect evidence for an alternative theory of Mendels?

A

Drosophila melanogaster - fruit fly

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2
Q

What will the F1 generation be if you cross a white eyed male with a normal red eyed female?

A

The F1 generation will all have red eyes

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3
Q

Is the gene for eye colour in fruit flies located on the X or Y chromosome?

A

It is located on the X chromosome

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4
Q

What is the chromosome theory of inheritance?

A

Genes are carried on chromosomes

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5
Q

What are linked genes?

A

Genes that are found on the same chromosome

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6
Q

In what phase of meiosis does crossing over occur?

A

Prophase 1

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7
Q

How can alleles of two genes be on the same chromosome be found in different gametes?

A

Crossing over

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8
Q

Is a crossover most likely to occur between genes that are closer together or farther apart?

A

Genes that are farther apart

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9
Q

What does the gene-chromosome theory suggest?

A

The genes exist at specific sites - they are arranged in a linear manner along the chromosome

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10
Q

What is map distance/units?

A

Distance between genes on a single chromosome

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11
Q

What are recombinant types?

A

F1 generations chromosomes that have different combinations of alleles than the chromosomes of the P generations

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12
Q

What are parental types?

A

When the chromosomes of the F1 generations are identical to those of the P generation.

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13
Q

The percentage of recombinant types in the F1 generation corresponds to what?

A

The recombination frequency.

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14
Q

What is the percentage of the amount times that a crossover occurs as P gametes are formed?

A

Recombination frequency

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15
Q

If the gene for eye colour and wing type are 10 map units apart, what is the recombination frequency?

A

10%

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16
Q

Which colour eyes is recessive in a fruit fly?

A

White eyes

17
Q

What are sex linked traits?

A

Traits that are controlled by genes on either the X or Y chromosome.

18
Q

Can Y linked traits be passed to the daughter from the father?

A

No, only affects the sons.

19
Q

What is an inactive chromosome called?

A

Barr body - condenses into this structure

20
Q

What is a visible effect of the inactivation of the X chromsome?

A

Calico or tortoiseshell coat coloar in cats

21
Q

What is the gene that codes for coat colour carried on in cats?

A

Located on the X chromosome

22
Q

Are tortoiseshell cats homozygous or heterozygous?

A

They are heterozygous for the black and orange allele
* One X chromosome carries the black allele
* The other X chromosome carries the orange allele

23
Q

What is a gene with more than two alleles said to have?

A

Multiple alleles

24
Q

What are the alleles for blood type?

A

IA, IB, and i

25
Q

What type of dominance is blood type IA and IB showing?

A

Co dominance

26
Q

What is the order of alleles in rabbit coat colour?

A

C > c^ch, c^h, c

27
Q

What is a continuous trait?

A

A trait that cannot be put into this or that.

28
Q

What controls continuous traits?

A

More than one gene

29
Q

What are polygenic traits?

A

Traits controlled by many genes

30
Q

What are polygenes?

A

A group of genes that all contribute to the same trait

31
Q

Which type of alleles contribute to a trait?

A

A dominant allele

32
Q

Would a corn with genotype AABB be tall or short?

A

Tall

33
Q

Would corn with genotype aabb be tall or short?

A

short

34
Q

If a truebreeding short ear corn crosses with a truebreeding long ear corn what would happen?

A

The F1 generation would be medium length

35
Q

At what temperature would a fly that is homozygous for culry wings have curly wings?

A

At 25 degrees celsius

36
Q
A

Biology 30 (33 decks)

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