GEOG 100 Quiz 8 - Sickle cell anemia is a recessive trait

American Military University GEOG 100 QUIZ 8 Week 8

Chapter 12- wk 8 Study Questions

Part 1 of 1 -         9.0/ 10.0 Points

Question 1 of 10

Sickle cell anemia is a recessive trait. A cross between two heterozygotes would produce what phenotypic ratio?

•             A. 1:2:1

•             B. 3:1

•             C. 2:2

•             D. 1:3

•             E. 4:0

 

Question 2 of 10

If genes are completely linked, all the offspring will be _________.

 

•             A. recessive

•             B. recombinants

•             C. parental

•             D. hybrids

•             E. dominant

 

Question 3 of 10

The allele for widows peak (H) is dominant for the allele for no widows peak (h). At a different gene locus, the allele for hitchhikers thumb (D) is dominant to the allele for non-hitchhikers thumb (d). A man is heterozygote for the traits and marries a woman who has no widows peak and is heterozygote for hitchhikers thumb. What is the man’s genotype?

•             A. HHDD

•             B. HhDd

•             C. HHdd

•             D. hhDD

•             E. hhdd

 

Question 4 of 10

Marfan syndrome is a dominant trait. A cross between a homozygous dominant and a heterozygote would produce what phenotypic ratio?

•             A. 1:2:1

•             B. 3:1

•             C. 2:2

•             D. 1:3

•             E. 4:0

 

Question 5 of 10

What statement describes X-linked traits? Select all that apply.

 A. Women can be carriers because they can be heterozygous for the trait

 B. X-linked traits are more common in men

 C. Males are never carriers since they only receive one X chromosome

 D. Males inherit X-linked traits from their fathers

 E. Women only have to have one affected gene to show the trait

 

Question 6 of 10

Low pitched male voices (RR) and a high pitched male voice (rr). Heterozygotes have a baritone voice. This is an example of _________.

•             A. incomplete dominance

•             B. codominance

•             C. Mendelian genetics (dominance and recessive

•             D. multiple alleles

 

Question 7 of 10

A and Z are independent events. The probability that A occurs is ¼. The probability that Z occurs is ¼. What is the probability that both will occur?

•             A. 1/4

•             B. 1/8

•             C. 1/3

•             D. 1/2

•             E. 1/16

 

Question 8 of 10

In a monohybrid cross from heterozygous parents, of the offspring would be what genotypes? Select all that apply.

 A. Homozygous recessive

 B. Homozygous dominant

 C. HeterozygotesXX

 D. Homozygous recessivesXX

 E. Homozygous dominantsX

 F. HeterozygoteX

 

Question 9 of 10

Determine what statements describe Huntington’s disease? Select all that apply.

 A. The disease is caused by a delayed action gene

 B. The diseases is autosomal dominant

 C. The disease is sex-linked so it is mostly seen in men

 D. Offspring have a 50% chance of inheriting the gene

 E. t is recessive lethal

 

Question 10 of 10

If a cross for widow’s peak was conducted between a homozygous dominant and a heterozygote, it is expected that all organisms of the offspring will have widow’s peak. Even though all have the widow’s peak, they can _________.

•             A. have more than one allele from a parent for the trait

•             B. have the exact same alleles

•             C. be genotypically different

•             D. be phenotypically different