Experimental evidences suggest that control of proximal-distal specification of the limb is correlated with the age of the progress zone mesenchyme. Match the following experiment (Column I) with their results (Column II).

Column I	Column II
A. when an early wing bud progress zone was transplanted to a late wing bud	I. Normal limbs form
B. when a late wing-bud progress zone was transplanted to an early wing bud	II. Lack of intermediate structures
C. when an early wing bud progress zone was transplanted to an early wing bud	III. An extra set of ulna and radius formed
D. when a late wing-bud progress zone was transplanted to a late wing bud

TLS Online TPP Program

#Question id: 12554

#Unit 10. Ecological Principles

Long-term studies of Belding's ground squirrels show that immigrants move nearly 2 km from where they are born and make up 1 to 8% of the males and 0.7 to 6% of the females in other populations. On an evolutionary scale, why is this significant?

TLS Online TPP Program

#Question id: 12555

#Unit 10. Ecological Principles

Demography is the study of

TLS Online TPP Program

#Question id: 12556

#Unit 10. Ecological Principles

Natural selection has led to the evolution of diverse natural history strategies, which have in common

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#Question id: 12557

#Unit 10. Ecological Principles

Natural selection involves energetic trade-offs between

TLS Online TPP Program

#Question id: 12558

#Unit 10. Ecological Principles

The three basic variables that make up the life history of an organism are

TLS Online TPP Program

#Question id: 12611

#Unit 10. Ecological Principles

Researchers in the Netherlands studied the effects of parental caregiving in European kestrels over 5 years. The researchers transferred chicks among nests to produce reduced broods (three or four chicks), normal broods (five or six),  and  enlarged  broods  (seven  or  eight).  They then measured the percentage of male and female parent birds that survived the following winter. (Both males and females provide care for chicks.) Brood Size Manipulations in the Kestrel: Effects on Offspring and Parent Survival

 

Which of the following is a conclusion that can be drawn from this graph?