In poultry, the genes for rose comb (R) and pea comb (P) produce walnut whenever they occur
together (R_ P_); single-combed individuals have the homozygous condition for both genes (rr pp).
(a) Give the F1 and F2 phenotypic results of a cross of a pure-breeding rose comb (RR pp)
with a pure-breeding pea comb (rr PP).
(b) Give the phenotypic results of a cross of Rr Pp ? rr Pp.
(c) Give the phenotypic results of a cross of RR Pp ? rr Pp.
(d) Give the phenotypic results of a cross of Rr pp ? rr Pp.
(e) Give the phenotypic results of a cross of Rr Pp ? rr pp. What will be an ideal response?
(a) F1: Rr Pp walnut; F2: 9 R_ P_ walnut, 3 R_ pp rose, 3 rr P_ pea, 1 rr pp single
(b) 3/8 walnut, 3/8 pea, 1/8 rose, 1/8 single
(c) 3/4 walnut, 1/4 rose
(d) 1/4 walnut, 1/4 rose, 1/4 pea, 1/4 single
(e) 1/4 walnut, 1/4 rose, 1/4 pea, 1/4 single
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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.
A population age structure diagram showing roughly equal numbers in each age group, such as in the United States population pyramid, depicts a
A. stable population.
B. population facing extinction.
C. declining population.
D. growing population.
E. very small population size.
It is now thought that the last common ancestor of the three domains was not a single lineage. Rather, it was ________
Fill in the blank(s) with correct word
Inheritance pattern in which an offspring has an intermediate phenotype, as when a red-flowered plant and a white-flowered plant produce pink-flowered offspring. ex. Curly hair
What will be an ideal response?