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
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Indicate whether the statement is true or false.
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
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.
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.