Genetics Answers

16.2B - Most genetics research is performed on model organisms, such as fruit flies, bacteria, mice, peas, or corn. Why?

Place a check mark next to every reason why humans are not good genetics test subjects:

Hint: There are 4 correct answers
Group of answer choices

Humans have too few offspring to be statistically significant

Human life-spans and generations are too long

Humans only possess dominant traits since we are highly evolved mammals

Human genetics are usually non-mendelian, which makes them very complicated to study

Humans do not express observable phenotypes

Human genotypes are always the wild-type and show little variation

It is unethical to perform genetics experiments that require the forced mating of humans

human dysplasia is transferred as recessive attribute linked with x chromosome
a) a man without this disorder marries a women whose father had this disorder but mother had healthy pedigree. what are the chances that new offspring will have this disorder?
b) a healthy women marries a man with this disorder, a sick girl and healthy son are born. what are the chances of another offspring born without disorder?

using true breeding dogs the lansing lab breeders have produced 922 black.long bair labradors and 282 white long haired labs is the coat color inherited in a mendelian fashion

using true-breeding dogs, the Lansing Lab breeders have produced 922 black (B) long haired Labrador retrievers and 282 white (b) long-haired labs. Is the coat color inherited in a Mendelian fashion? Support your answer with chi-square analysis by filing out a table

The frequency- deoendent selection, as seen in the case of thraot color in the bloated sided lizards tend to:
a. elimante rare alleles and favor whitchever allele is intialling most frequent
b. produce random changes in allele frecuencies
c. maintain two or more phenotypes in a population
d. lead to heterozygous advantage
e. stimulate new mutations

miRNAs are relatively short, on the order of 21-23 nucleotides, they only bind to mRNAs that are a perfect complementary match to the entire length of the miRNA.
A. TRUE
B. FALSE

What are 3 parts of dna nucleotide

what is the complementary DNA strand that is created from the template 3’ GATCAAAATGT during replication

A fruit fly that heterozygous for gray body with vestigial wings (b+ b+ vg+ vg) is mated with one that is true-breeding for black body with normal wings (b b+ vg vg). The genes for body color and wing structure are on the same chromosome. From previous research you know that they are 19 map units apart.

What are the possible offspring that could come from this cross? Label the offspring parental or recombinant.



What is the phenotypic ratio you would expect if the genes were on separate chromosomes?



What is the phenotypic ratio you would expect knowing that they are only 19 units apart

In our population the incidence of polyposis of the large intestine is 1:8,000. The disorder is determined by the autosomal dominant allele. What is the frequency of disease-causing allele in the population?