The developmental stage represented in Figure 51-2 is:

a. a morula.
b. an early blastula.
c. a late blastula.
d. an early gastrula.
e. a middle gastrula


E

Biology & Microbiology

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Indicate whether the statement is true or false.

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The X and Y chromosomes ____

a. are responsible for autosomal recessive inheritance b. will lead to color-blindness in all carriers c. are found paired with all 22 autosomal chromosomes d. are responsible for albinism e. play major roles in determining the sex of an individual

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Two persons who have recessive genetic deafness marry and have 6 children. All the children can hear. The reason they can hear is most likely due to

A) epistasis. B) pleiotropy. C) sex linkage. D) complementation. E) partial penetrance.

Biology & Microbiology

Based upon today’s molecular evidence, Homo sapiens appear to have originated from:a

Europe. b. Indonesia. c. East Africa. d. South Africa. e. South America.

Biology & Microbiology