Biology Answers

A couple is planning to have children. The male is heterozygous for huntingtons disease and homozygous dominant for Tay-Sachs. The couple is curious about the possibility and probability of their offspring inheriting Tay-Sachs and/or Huntingtons. Huntingtons disease is dominant over the normal condition(h), and the normal condition is dominant(T) over Tay-Sachs(t). Complete a punnett square for this cross and determine the phenotypic ratios for the couple having a normal child(no disease), Tay-Sachs but no Huntingtons, Huntingtons but no Tay-Sachs, and both Huntingtons and Tay-Sachs.

In 2000 and 2004, a University of Michigan palaeontologist discovered two well-preserved skeletons of a now-extinct species, about 47.5 million years old. He named this newly-discovered species Maiacetus inuus. He described them as skeletons of early whales that actually lived on land, before whales had evolved to become entirely aquatic like modern-day whales.

a) Explain how you would use the fossil record as evidence to suggest that Maiacetus inuus is an evolutionary ancestor of the modern-day whale.

b) Assume that traces of preserved DNA were discovered inside of the Maiacetus inuus fossils. Explain how this DNA could be used to show an evolutionary relationship between Maiacetus inuus and modern-day whales.

Do yeast cells have the enzyme sucrase?

What are the products of alcoholic fermentation?

Is the production of Interstitial fluid possible in modern laboratories? along with plasma to make up Extracellular fluid?

Hybridization of a homozygous dominant and homozygous recessive plant was conducted. What is the probability that the F2 will have the phenotype green, small and spade shaped leaves with pink and rounded fruits?

Name The Functional Groups Present In A Galactose Molecule

What is the best culture media for a carp or catfish tissue culture, this media will be used long-term. Preferably a natural media, due to its biodegradability.

which hormone is not produced from placenta at all
a) estrogen
b) progesterone
c) LTH
d) lactogen

Suggest and explain how the genetic make-up of the seedling compares with that of the parent plant