11. Which of the following would likely be the most common in natural population

Question

11. Which of the following would likely be the most common in natural populations of any organism, including humans?

• continuously varying traits affected substantially by both genes and environment

• discontinuously varying mutant traits

• discontinuously varying traits unaffected by environmental factors

• continuously varying mutant traits

Lecture Series 2

1. The nuclear genome of a normal diploid organism would consist of

a. more than one pair of linear chromosomes

b. more than two unpaired linear chromosomes

c.at least one unpaired circular chromosome

d. at least one pair of circular chromosomes

2. Members of chromosome pairs are described as homologous because each member

is about the same shape, but very different genetically

differs in shape and size from the other member

is identical to the other member of the pair

carries essentially the same genetic information

3. Which phase of mitosis best allows chromosomes to be identified?

interphase

prophase

metaphase

anaphase

4. The chromosome number among eukaryotic diploids varies

greatly, without respect to the complexity of the organism

little, with nearly all eukaryotes having about 20 or 30 chromosome pairs

greatly with more complex organisms having a greater number of chromosomes

such that humans have more chromosomes than any other organism

5. Eukaryotic chromosomes differ from those of viruses and prokaryotes in that

prokaryotic chromosomes are usually made of RNA

prokaryotic chromosomes are usually larger than those of eukaryotes

eukaryotic chromosomes contain proteins called histones, which stabilize them

prokaryotic chromosomes contain extensive noncoding regions called exons

6. A man and a woman wish to have a karyotype of their unborn child. This means that they

wish to have some biochemical tests run on the amniotic fluid

want a geneticist to determine the chance of the child inheriting a certain disease gene

would like to see a picture of the chromosomes of their child

will be able to correct certain genetic deficiencies

7. Which of the following has the least number of chromosomes?

a sex cell before meiosis

a sex cell after meiosis

a body cell before mitosis

a body cell after mitosis

Explanation / Answer

11. • continuously varying traits affected substantially by both genes and environment

1. a. more than one pair of linear chromosomes

Explanation:-

2. carries essentially the same genetic information

explanation:-

3. metaphase

4. greatly, without respect to the complexity of the organism

5. prokaryotic chromosomes contain extensive noncoding regions called exons

6. would like to see a picture of the chromosomes of their child

7. a sex cell before meiosis

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