Bio Quiz 11 Wanda

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1. 
Gregor Mendel's work was different from that of other researchers working on inheritance in his day because he alone:
 
actually counted the numbers and types of offspring
 
2. 
If several traits are affected by the same allele, the allele is said to be:
 
pleiotropic
 
3. 
Foxes, cats, and rabbits have enzymes that are heat-sensitive, causing a seasonal variation in coat color due to:
 
an environmental effect
 
4. 
The diploid number of chromosomes in pea plants is 14. What is the haploid chromosome number?
 
7
 
5. 
Human height shows a continuous variation from the very short to the very tall. Height is most likely controlled by:
 
multiple genes
 
6. 
White flower color is
recessive to purple. What is the genotypic ratio when two heterozygous pea
plants are crossed?
 
1:2:1
 
7. 




 


 

Red-green colorblindness is a sex-linked trait. A woman with
  normal color vision, whose father was colorblind, mates with a colorblind man. What chance do each of their sons have of being colorblind?

  

 
50% chance
 
8. 
What is the probability of getting a pea plant with recessive green seed color when two heterozygous pea plants, both having the dominant yellow-seeded phenotype, are crossed with each
other?
 
1 in 4
 
9. 
Humans who have lost one
copy of a chromosome are called ____________ and generally do not survive
development
 
monosomics
 
10. 
Nondisjunction of
chromosomes resulting in aneuploidy occurs during:
 
anaphase I or II
 
11. 
Mendel tested for
heterozygotes by using:
 
testcross
 
12. 
The degree of earlobe attachment in humans is  inherited as a simple dominant of free earlobes, or as a recessive allele of attached earlobes. What is the probability that a woman
with attached earlobes will have children with attached earlobes if their father has free earlobes, but his father had attached earlobes?
 
1 in 2
 
13. 
Genes for sex-linked traits
tend to be carried on what chromosomes?
 
X chromosomes
 
14. 
Hemophilia is a group of
different inherited blood-clotting disorders. Which is true about hemophilia?
 
It is more common in males
than in females
 
15. 
A central role for
chromosomes in heredity was first suggested by:
 
Karl Correns
 
16. 
Two true-breeding pea
plants are crossed, one with purple flowers and the other with white. Their
offspring are:
 
heterozygous with the
dominant phenotype
 
17. 
Down syndrome in humans is
due to:
 
trisomy (three copies of
chromosome #21)
 
18. 
In the human ABO blood
grouping, there are four basic blood types, type A, type B, type AB, and type
O. The blood proteins A and B are:
 
codominant
 
19. 
Which of the following is a
sex-linked disorder?
 
Duchenne muscular dystrophy
 
20. 
Which procedure is the
least-invasive method of assessing fetal health while development is still
occurring?
 
Ultrasound
 
21. 
The ability to taste PTC is
a dominant trait. If a heterozygote woman has a child with a man who is not a taster,
what is the chance their child will be a taster?
 
50%
 
22. 
Whose work with fruit flies
presented the first clear evidence that the genes determining Mendelian traits
reside on chromosomes?
 
Thomas Hunt Morgan
 
23. 
What is the product of
transcription?
 
RNA
 
24. 
In snapdragons,
pink-flowered plants are produced when red-flowered plants are crossed with
white-flowered plants. This type of inheritance can best be described as:
 
incomplete dominance
 
25. 

The outward expression of
an organism's genotype is referred to as its genotype.
 
FALSE