FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 5: Linkage, Recombination, and the Mapping of Genes on Chromosomes

Show Answer

Share

---

All types

Filters

Study Flashcards

Question 41

Multiple Choice

Review LaterAdd Note

Review Later

In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles.The wild-type alleles (sn⁺ and car⁺) are responsible for straight bristles and red eyes, respectively.A sn car female is mated to a sn⁺ car⁺ male and the F₁ progeny are interbred.The F₂ are distributed as follows: $\begin{array} { | l | r | } \hline s n~ c a r & 55 \\\hline s n~ c a r^+ & 45\\\hline s n ^{+ c a r} & 45 \\\hline s n ^ { + c a r +} & \underline{55} \\\hline & 200 \\\hline\end{array}$ -What is the p value from this test? (Pick the most accurate choice. )

A) p > 0.5
B) 0.1 < p < 0.5
C) p < 0.1
D) p < 0.05
E) p < 0.01

Correct Answer

verified

Show Answer

Question 42

Multiple Choice

Review LaterAdd Note

Review Later

The R and S genes are linked and 10 map units apart.In the cross R s / r S × r s / r s what percentage of the progeny will be R s / r s?

A) 5%
B) 10%
C) 25%
D) 40%
E) 45%

Correct Answer

verified

Show Answer

Question 43

Multiple Choice

Review LaterAdd Note

In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males. The resulting trihybrid F1 females are testcrossed. The F2 are distributed as follows: $\begin{array} { | l | r | } \hline y f v & 3210 \\\hline y f v ^ { + } & 72 \\\hline y f ^ { + } v & 1024 \\\hline y f ^ { + } v^ + & 678 \\\hline y ^ { + } f v & 690 \\\hline y ^ { + } f v ^+ & 1044 \\\hline y ^ { + } f ^+ v & 60 \\\hline y ^ { + } f ^+ v^ + & 3222 \\\hline & 10,000 \\\hline\end{array}$ -What is the coefficient of coincidence in this region?

In peas, tall (T) is dominant to short (t) , red flowers (R) is dominant to white flowers (r) , and wide leaves (W) is dominant to narrow leaves (w) .A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves.The resulting progeny are shown in the table. $\begin{array}{|l|r|}\hline \text { tall, red, wide } & 381 \\\hline \text { tall, white, wide } & 122 \\\hline \text { short, red, wide } & 118 \\\hline \text { short, white, wide } & 379 \\\hline & 1000 \\\hline\end{array}$ -What is the genotype of the tall plant that has red flowers and wide leaves?

What does the data analysis allow you to conclude about linkage between sn and car? (Select all that apply. )

The diploid garden pea plant has 14 chromosomes.The haploid fungus Neurospora crassa has 7 chromosomes.Neither organism has separate male and female individuals.Therefore, the number of linkage groups in these two organisms is

A female mouse from a true-breeding wild-type strain was crossed to a male mouse with apricot eyes (ap) and grey body (gy) .The F₁ mice were wild-type for both traits.When the F₁ were interbred, the F₂ were distributed as follows: Females $\begin{array} { | l | l | } \hline \text { all wild type } & 200 \\\hline\end{array}$ Males $\begin{array} { | l | r | } \hline \text { wild type } & 91 \\\hline \text { apricot } & 11 \\\hline \text { grey } & 9 \\\hline \text { apricot, grey } & 89 \\\hline\end{array}$ Which of the following statements is correct?

A dihybrid testcross is made to determine if genes C and D are linked.The results are shown in the table. $\begin{array}{|l|c|r|}\hline \text { Parent genotypes: } & C c &nbsp;D d \times c c d d & \\\hline & C c&nbsp; D d & 222 \\\hline & C c &nbsp;d d & 280 \\\hline \text { Progeny genotypes: } & c c &nbsp;D d & 280 \\\hline & c c &nbsp;d d & 218 \\\hline & & 1000 \\\hline\end{array}$ -Given this data, use Table 5.2 to find the most accurate range within which the p value falls.

The hypothesis that predicts no linkage between genes is known as the null hypothesis.

Individuals heterozygous for the RB⁺ and RB⁻ alleles can develop tumors as a result of (Select all that apply. )

The R and S genes are linked and 10 map units apart.In the cross R s / r S × r s / r s what fraction of the progeny will be R S / r s?

The cross L p q / l P Q × l p q / l p q is carried out.If the L gene is in the middle, between genes P and Q, what would be the genotypes of the double crossover gametes in this cross?

Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations.The offspring are as follows: \begin{array}{|l|r|}\hline p x &nbsp;s p &nbsp;c n & 1461 \\\hline p x &nbsp;s p&nbsp; c n^{+} & 3497 \\\hline p x&nbsp; s p{+&nbsp;c n} & 1\\\hline p x&nbsp; s p^{+}&nbsp; c n+ & 11 \\\hline p x^{+} &nbsp;s p &nbsp;c n & 9 \\\hline p x^{+} &nbsp;s p &nbsp;c n+ & 0 \\\hline p x^{+}&nbsp; s p+&nbsp;c n & 3483 \\\hline p x^{+}&nbsp; s p+&nbsp;c n+ & 1539 \\\hline & 10,000 \\\hline\end{array} -Which of the three genes is in the middle?

Which type of tetrad contains two recombinant and two parental spores?

The map of a chromosome interval is: A--10 m.u.--B--40 m.u.--C From the cross A b c / a B C × a b c / a b c, how many double crossovers would be expected out of 1000 progeny?

In tetrad analysis, which result would indicate that two genes are linked?

In Neurospora, the white-spore allele (ws) results in white spores rather than the wild-type black spores. Diploid ws / ws+ cells undergo meiosis followed by one round of mitosis to form ordered tetrads. Indicate if the pattern of spores seen in the tetrads are consistent with first-division or second-division segregation. -ws^{+; ws+; ws; ws; ws+; ws+; ws; ws}

In Neurospora, the white-spore allele (ws) results in white spores rather than the wild-type black spores. Diploid ws / ws+ cells undergo meiosis followed by one round of mitosis to form ordered tetrads. Indicate if the pattern of spores seen in the tetrads are consistent with first-division or second-division segregation. -ws; ws; ws^{+; ws+; ws; ws; ws+; ws+}