Final part 5 Flashcards

1
Q

You analyze a slide with animal cells in meiotic stages under a light microscope. What would you look for if you wanted to identify Anaphase II cells on the slide?

A

Separated sister chromatids at each pole of the cell

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2
Q

New combinations of linked genes are due to what?

A

crossing over

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3
Q

If you started out with one parental cell that had 16 chromosomes and a while later you viewed that you now had two cells, each with only 8 replicated chromosomes randomly distributed, you would likely conclude that this cell was in what phase?

A

telophase 1

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4
Q

skin color is a trait with four genes and two alleles of each (light or dark allele). Skin color depends on the number of dark or light alleles a person has and so shows a lot of variation. We call this type of trait what?

A

continuous

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5
Q

One gene controls skin color in a specific alien race. There are two expressions of this gene, either red skin or blue skin. All of the offspring of a cross between an alien with red skin and an alien with blue skin have purple skin. This result most likely indicates which of the following patterns of inheritance?

A

incomplete dominance

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6
Q

If a calico cat (female) mates with a black male cat, what are the possible phenotypes of the female offspring?

A

50% calico and 50% black

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7
Q

How would one explain a test-cross involving F1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced?

A

two genes are linked

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8
Q

When red flowers are crossed with white flowers, the F1 generation results in flowers that have red and white splotches. This is most likely due to:

A

codominance

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9
Q

A dihybrid cross between a plant with long, smooth leaves and a plant with short, rough leaves produced an F1 generation with all long, smooth leaves, which are 100% heterozygous for both traits. Smooth is dominant over rough and long is dominant over short. This means that the parental genotypes were?

A

LLSS x llss

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10
Q

what are autosomes?

A

all of the chromosomes other than sex chromosomes

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11
Q

What are events that can lead to genetic variation?

A

independent assortment of chromosomes and crossing over

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12
Q

An organism has 12 chromosomes in its diploid state. How many “types” of chromosomes does it have, and how many chromosomes do its gametes have?

A

6 types of chromosomes and 6 chromosomes

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13
Q

When does DNA replication happen?

A

the S phase of the cell cycle

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14
Q

What is the protein that allows tetrads to form known as?

A

synaptonemal complex

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15
Q

What is a karyotype?

A

a display of every pair of homologous chromosomes within a cell, organized by size and shape

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16
Q

Suppose a father of blood type A and a mother of blood type B have a child of type O. What blood types are possible in their subsequent children?

A

A, AB, B, O

17
Q

When a nerve impulse travels from node to node, we call this?

A

saltatory conduction

18
Q

When a neurotransmitter is secreted into a synaptic cleft from the presynaptic membrane, it has the following effect:

A

binds with a membrane protein at the postsynaptic membrane AND may cause sodium channels to open at the postsynaptic membrane

19
Q

Which of the following structures pick up information from the surrounding environment and from nearby neurons?

A

Dendrites

20
Q

The juncture at which information is exchanged between a presynaptic and a postsynaptic neuron is called the:

A

Synapse

21
Q

The point at which an action potential is first initiated?

A

Axon hillock

22
Q

Which of the following is a function of Schwann cells?

A

provide myelination for the axon

23
Q

When an action potential reaches the terminal end (terminal branches), what occurs?

A

Calcium channels open AND neurotransmitter vesicles fuse with the PREsynaptic membrane AND exocytosis of neurotransmitter occurs AND calcium enters the presynaptic cell

24
Q

What applies with respect to motor neurons?

A

form part of the peripheral nervous system AND receive information from the central nervous system AND transmit information to glands, muscles, and other structures to cause a response AND can form synapses with other motor neurons or with muscle tissue

25
Q

What is the purpose of the sodium inactivation gates?

A

rendering the sodium channels unresponsive to stimuli AND prevent the signal from traveling backwards AND prevent another depolarization on a previously depolarized segment of the cell