Question

1.
Choose the best answer.

Some traits we see are determined by more than one pair (poly) of genes. Such traits are called ___.

polygenic

physical

pleiotropy

inherited
2.
Choose True or False.

Outside factors, such as the mother's health while a baby is developing in the womb or nutrition as a child grows, can affect one's phenotype.


False

True
3.
Choose the best answer.

Breeders of plants and animals also use ___ to help them determine the traits (good or bad) that will be passed on.

recombinant DNA

genetic engineering

human genome project

pedigree mapping
4.
Choose the best answer.

Down's syndrome is an example of ___.

polyploidy

triploidy

pleiotropy

incomplete penetrance
5.
Choose the best answer.

A(n) _____ can occur when both members of the gene pair—one from each parent—are abnormal.

incomplete penetrance

recessive genetic disorder

dominant genetic disorder

intermediate expression
6.
Select 2 that apply.

The human blood type is an example of the expression of ___ and ___ in complex inheritance.

multiple-allele series

codominance

polygenic trait

codon
7.
Choose True or False.

Sex-linked genetic disorders are more prevalent in females because they have only one X chromosome and therefore, do not have a normally functioning X chromosome to counter disorders carried on the X chromosome.


True

False
8.
Choose the best answer.

A gene that alters the phenotypic expression of another gene is called a ___ gene.

recessive

modifying

dominant

regulating
9.
Choose the best answer.

___ is said to be reduced or incomplete when some individuals fail to express the trait, even though they carry the allele.

Polygenic

Intermediate expression

Penetrance

Polyploidy
10.
Select the term for the given definition.
an individual who serves as host for an infectious agent but who does not show any apparent signs of the illness


pleiotropy

polygenic trait

carrier

plasmid
11.
Choose the best answer.

A(n) ___ can be caused by a single abnormal gene from either parent.

incomplete penetrance

intermediate expression

recessive genetic disorder

dominant genetic disorder
12.
Choose the best answer.

___ are accidental changes in a genomic sequence of DNA.

Codominance

Modifying genes

Pleiotropy

Mutations
13.
Choose the best answer.

A(n) ___ is when a single base pair is altered.

deletion

substitution

point mutation

insertion
14.
Choose the best answer.

____________ includes a wide range of mechanisms that are used by cells to increase or decrease the production of specific gene products.

Genetic engineering

Gene modification

Intermediate expression

Gene regulation
15.
Choose the best answer.

The situation in which a heterozygous genotype is associated with a phenotype that is more or less intermediate between the phenotypes controlled by the two homozygous phenotypes is ___________.

regulating gene

incomplete penetrance

modifying gene

intermediate expression

Answer 1

1. polygenic

2. True

3. pedigree mapping

4. polyploidy

5. recessive genetic disorder

6. multiple-allele series; codominance

7. False

8. modifying

9. Penetrance

10. carrier

11. dominant genetic disorder

12. Mutations

13. point mutation

14. Gene regulation

15. intermediate expression