FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 20: Developmental Genetics

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 1

Essay

Review LaterAdd Note

Review Later

What are Hox and MADS genes,and what do they have in common?

Correct Answer

verified

Hox genes are animal genes sharing a hom...

View Answer

Show Answer

Question 2

Short Answer

Review LaterAdd Note

Review Later

If a cell from the blastoderm of the Drosophila embryo is committed to form part of an abdominal segment of the adult,such as the sixth one,and this cell is transplanted into the thorax-committed region of another embryo,will it develop properties of a thoracic or an abdominal segment?

Correct Answer

verified

Show Answer

Question 3

Short Answer

Review LaterAdd Note

Certain species of lilies,if eaten by pregnant ewes,can cause the ewes to produce lambs with severe birth defects because the plants' cyclopamine can block embryonic response to Shh.This type of birth defect is a phenocopy of mutations in which genes?

Drosophila mutations such as bcd,if homozygous in the mother,produce offspring with lethal defects,no matter what the genotype of the offspring.For some other genes,the mutant phenotype can be "rescued" by introducing a wild-type allele.Why the difference?

The process by which the presence and activity of neighboring cells determine an aspect of development is called ________.

In Drosophila and other animals,Hox genes encode transcription factors that control development;but in Arabidopsis,a different family of transcription factors is produced with a different set of conserved amino acids.These are encoded by what group of genes?

Which of the groups of early developmental genes in Drosophila act across segment boundaries to produce parasegments?

In Drosophila,germ cells develop from pole nuclei isolated from the rest of the embryo at the posterior end.How are they "protected" from the effects of posterior concentrations of zygote-produced mRNAs and proteins?

In an organism such as a sea urchin,administration of actinomycin D prevents RNA synthesis.However,early development up to gastrula formation can take place in the presence of actinomycin D but gastrulation cannot.This implies that

Holoprosencephaly is a highly variable condition in mammals,including humans.Its effects range from an absence of brain areas,mid-face disorders,and cyclopia to slight dental abnormalities.One form,HPE3,is caused by Shh mutations.Familial cases are inherited as dominants.Which of the following do you expect?

The establishment of the axes of the body plan occurs during which stage of Drosophila development?

Molecules whose concentration and position in an embryo determine some aspect of development are called ________.

Polycomb group (PcG) mutants cause gain-of-function of Antennapedia (Antp) and other homeotic genes by causing some of these genes to be expressed in tissues where they are usually repressed.PcG has a domain that binds to methylated histone H3.This finding supports which of the following hypotheses?

How and when does the Antennapedia complex change antennae into legs?

Which group of genes in Drosophila embryos must be mutated if the result is elimination of a significantly sized,contiguous region of segmentation?

What genetic evidence can demonstrate that some developmental events are due to chemical signaling?

A highly conserved protein domain of 60 amino acids is found in a large number of animals.This domain allows the proteins in question to bind to what?

Use of double mutants has been invaluable in studying developmental pathways.In C.elegans,sex is determined by the ratio of sets of autosomes to X chromosomes.A diploid male has one X,and diploid hermaphrodites have two X's.The loss-of-function gene her-1 produces XO worms that are hermaphrodites,but XX worms are unaffected.Mutation of a second gene,tra,causes the XX to develop as male.Given this information,what would be the phenotype of a tra,her-1 double mutant?

An embryonic stem cell has the potential to differentiate into any cell or tissue type.Is it differentiated,pluripotent,or totipotent?

Use a description of C.elegans development to distinguish clearly between differentiation and determination.