Genetics Answers

Long stems are dominant over short stems in rose plants. Determine the phenotypic and genotypic ratios of the F₁ offspring from the cross pollination of a heterozygous long stem rose plant and a short stem plant

Two black guinea pigs were mated and over several

years produced 29 black and 9 white offspring.Explain these results, giving the genotypes of parents

and progeny.

A patient comes into your clinic with unexplained paralysis in her limbs. She has no history of neuromuscular problems. After further questioning you find that that she had taken a drug “X.” Explain the effect of a possible toxin in the drug on actin filaments that might be the cause of her paralysis.

Transgenic technology have disadvantages like allergic reaction, emergence of super pests and loss of biodiversity. So how we can prevent or overcome this issues?

When you were young you may have encountered some of your relatives telling you that you have the same eye color as that your mother or your nose has the same shape as that of your father. As you look closely to them you found out that you do not completely look a like. What do you think is the reason?

One reason for these differences is due to: just pick one and why?

A.) Crossing over

B.) Evolution

C.) Formation

D.) Mutation

During your shift at the clinic, a young man arrives with a red, scaly rash formed into rings. What is this patient’s diagnosis likely to be? What causes this condition? How can he avoid this rash in the future?

There is an extremely high level of genetic similarity in humans, with greater than 99% sequence identity across populations. Although this similarity is extremely high, many people appear very different phenotypically. How do you resolve these contrasting observations?

The correlation coefficient is a measure of the strength of association between two traits. Correlation, however, does not indicate causation (interconnection). Think of one or two variables (not necessarily phenotypes) that are correlated and are causally linked, and one or two variables that may be correlated but are not likely to be causally linked.

In the United States, approximately one child in 10,000 is born with PKU (phenylketonuria), a syndrome that affects individuals homozygous for the recessive allele (aa)

Show your working in calculating the following:

i) Frequency of the recessive allele.

ii) Number of individuals who are carriers for this trait.

Assume a three point cross in which the F1 aa ⁺ bb⁺ Dd⁺ was crossed to aabbdd and the offspring had the following genotypes:

GENOTYPES Number

aa ⁺ bb⁺ Dd⁺ 621

aa ⁺ bb⁺ Dd⁺ 3

aa ⁺ bb⁺ Dd⁺ 64

aa ⁺ bb⁺ Dd⁺ 103

aa ⁺ bb⁺ Dd⁺ 109

aa ⁺ bb⁺ Dd⁺ 57

aa ⁺ bb⁺ Dd⁺ 7

aa ⁺ bb⁺ Dd⁺ 608

i. Indicate the parental and recombinant genotypes

ii. Indicate the double recombinants

iii. Costruct a genetic map of these three loci, including their order and map distance bewteen them.