Answer:
610:190 round seeds: wrinkled seeds
Explanation:
A cross between two true breeds, involves crossing two parents that are each homozygous for the traits they carry.
A cross between a true breeding round parent (RR) and a true breeding wrinkled plant (rr), will produce all heterozygous offspring:
Rr : 100% in the F1 generation.
When these heterozygous offspring are crossed, Rr x Rr, the proportion obtained genotypically in the second filial generation is:
- 25% homozygous round (RR)
- 25% homozygous wrinkled (rr)
Considering the importance of dominance in phenotypic expression, round seeds being dominant over wrinkled seeds, indicates that about 75% of the offspring are expected to appear round and 25% expected to appear wrinkled. Putting this phenotypic proportion into perspective,
<em>610:190 round seeds:wrinkled seeds,</em> is the ratio in line with the proportion expected to see in the F2 generation.
Answer:
The correct answer is - 11.25
Explanation:
Given:
Average weight gain between weeks 2 and 4 = 10 grams
The narrow-sense heritability of the weight gain between 2 and 4 weeks
= 25%
Then
Average weight gain would be expected among the offspring of parents whose average gain was 15 grams-
by the formula:
Average weight gain between weeks + (h) (Average weight gain between weeks - parents average gain )
= 10 + 0.25 (15-10)
= 10 + 0.25 (5)
= 10 + 1.25
= 11.25
Thus, the correct answer is - 11.25