The Convergence in External Morphology of Sharks, Penguins, and Porpoises

Topics: Gene, Allele, Genetics Pages: 3 (468 words) Published: July 29, 2014
The convergence in external morphology of sharks, penguins, and porpoises is attributed to selection pressures that are common to these groups

Genes that are located on the same chromosome are all of these

An incompletely dominant gene controls the color of chickens so that BB produces black, Bb produces a slate-gray color called blue, and bb produces splashed white. A second gene controls comb shape, with the dominant gene R producing a rose comb and r producing a single comb. If a pure-breeding black chicken with a rose comb is mated to a splashed-white chicken with a single comb in the F2 generation, what fraction of the offspring will be blue with single comb? 1/8

The speciation of cichlids of the same African crater lake is an example of sympatry.

In Exhibit 13.4, homologous chromosomes are indicated by a and b

In a pedigree chart, a male showing the specific trait being studied is indicated by a darkened square.

If all offspring of a cross have the genotype Aa, the parents of the crosses would most likely be AA  aa.

Mules are sterile because they have an odd number of chromosomes

A locus is the location of an allele on a chromosome

Scientists began to question the perfection of the Chain of Being because of all of these.

The border across which genes can flow between two populations is called the contact zone.

Hybrid organisms produced from a cross between two pure-breeding organisms belong to which generation? F1

Symptoms of phenylketonuria (PKU) may be minimized or suppressed by a diet low in phenylalanine.

The 30-cm floral tube of Angraecum and the 35-cm proboscis of its hawkmoth pollinator are the result of coevolution.

A person with one copy of a mutated CFTR gene will be healthy

Which is NOT necessary for sympatric speciation? geographical barriers

In many bird species, males are flashier than females. This occurs because all of these.

If tall (D) is dominant to dwarf (d), and two homozygous...
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