Question 1

The maximum map distance that can be observed in a cross concerning two loci is ___ map units.

Accepted Answer

The answer of The maximum map distance that can be...

Question 2

In an experiment, two homologous chromosomes with alleles as shown below (original homologous chromosomes) underwent meiosis and to product four chromosomes (resultant chromosomes). How many crossovers appear to have occurred during meiosis?

Accepted Answer

The answer of In an experiment, two homologous chromosomes with...

Question 3

Genes that are located close together on a homologous chromosome are more likely to be inherited together than genes that are further apart.

Accepted Answer

A) True 
 B)False

Question 4

A Drosophila parent fly heterozygous for alleles for black body, dumpy wings, and purple eyes was test-crossed to a fly that was homozygous recessive for all three genes. The genes are all on the same chromosome. The offspring had the following phenotypes in the following numbers:
$\begin{array}{|l|c|}
\hline \text { Phenotype } & \text { Number of offspring } \
\hline \text { wild type } & 225 \
\hline \text { black body, purple eyes, dumpy wings } & 238 \
\hline \text { dumpy wings } & 122 \
\hline \text { black body, purple eyes } & 135 \
\hline \text { black body, dumpy wings } & 15 \
\hline \text { purple eyes } & 19 \
\hline \text { purple eyes, dumpy wings } & 6 \
\hline \text { black body } & 5 \
\hline
\end{array}$ What were the genotypes of the chromosomes in the parent? Please select all that apply.

Accepted Answer

A)  bS1U1P1+S1S1P0 pS1U1P1+S1S1P0 dS1U1P1+S1S1P0 
B)  S1S1P0 b p d 
C)  bS1U1P1+S1S1P0 p dS1U1P1+S1S1P0 
D)  b pS1U1P1+S1S1P0 d 
E)  bS1U1P1+S1S1P0 pS1U1P1+S1S1P0 d
F) b pS1U1P1+S1S1P0 dS1U1P1+S1S1P0

Question 5

Match the missing words in the following phrase. Genes are [A] if they are on the same chromosome and are [B] if they are on different chromosomes. Genes that are on different chromosomes segregate [C] at meiosis whereas genes on the same chromosome are more frequently inherited [D].

Accepted Answer

The answer of Match the missing words in the following...

Exam 9: The Locations of Genes on Chromosomes: Linkage and Genetic Maps

The maximum map distance that can be observed in a cross concerning two loci is ___ map units.

In an experiment, two homologous chromosomes with alleles as shown below (original homologous chromosomes) underwent meiosis and to product four chromosomes (resultant chromosomes). How many crossovers appear to have occurred during meiosis?

Genes that are located close together on a homologous chromosome are more likely to be inherited together than genes that are further apart.

Match the missing words in the following phrase. Genes are [A] if they are on the same chromosome and are [B] if they are on different chromosomes. Genes that are on different chromosomes segregate [C] at meiosis whereas genes on the same chromosome are more frequently inherited [D].