99 Mean survival rate (females) -22- Mean survival 90rate (males 80 70 60 s 50 F

Question

99 Mean survival rate (females) -22- Mean survival 90rate (males 80 70 60 s 50 Females Males 30 F 20 10 9 10 11 Birth weight (Ib) 6. The graph above plots survival vs. birth weight for human babies. What type of selection is operating? (a) stabilizing (b) disruptive (c) directional (d) negative frequency-dependent 7. Broad sense heritability differs from narrow sense heritability in that: (a) for broad sense heritability, Vo includes only additive effects of alleles (b) for broad sense heritability, Vg includes additive, dominance, and epistatic effects (c) broad sense heritability includes only components of variance that cause ofspring to resemble their parents (d) all of the above (e) none of the above

Explanation / Answer

6. Here stabilizing selection is operating. In this type of selection force works at center so also called centripedal or balancing selection. In the graph above highest survival rate is found in centre. But in both left and right side of the graph shows low survival rate of babies.

7. Broad sense heritability is the proportion of total variation which comes due to genotype whereas narrow sense heritability is the proportion of total variation comes due to additive effect. Genotype is expressed by VG that includes additive, dominant and epistatic effects.

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