You discover a new allele of a gene important for tail formation in mice. WT mice have long tails, but mice heterozygous for the allele have short tails
When you cross two heterozygous mice together, you obtain a 2:1 ratio of short-tailed mice to long-tailed mice. None of the short-tailed progeny are homozygous. What type of allele results in short tails? A) dominant negative allele
B) temperature-sensitive allele
C) lethal allele
D) partially dominant allele
E) incompletely penetrant allele
C
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Which one of the following is not a true statement about Klinefelter syndrome?
A. Affected males have small testes. B. Affected males can reproduce normally. C. Affected males tend to be tall for their age. D. Affected males have a normal penis and scrotum. E. Affected males have sparse pubic and facial hair.
In a biology lab experiment, you and your classmates planted seeds from eudicot and monocot plants in soil that had been processed to remove nutrients. The seeds of each plant were still able to perform metabolism, enabling them to germinate and develop into seedlings. The nutrients were provided from the
A. spore coat. B. seed coat. C. endosperm. D. pollen grain. E. fruit.
The process by which genetic material is exchanged between different species, such as an endosymbiont and its host, is:
A. mutualism B. parasitism C. vertical gene transfer D. horizontal gene transfer E. binary fission
Studies of the Pax6 gene and its homologs suggest that
A. the eyes of many different species are descended from a common ancestor. B. the master genes of the eye in various species are not homologous. C. the simple eyes of invertebrates and complex eyes of vertebrates arose from two different ancestral control genes. D. the eye has evolved independently multiple times.