Consider the following case of blending inheritance. A population of plants starts out with an equal number of individuals of heights 40 and 60 cm. The parents mate randomly, and the height of an offspring is exactly equal to the average height of its parents. Find the probability of each of the possible matings of the offspring. Out of 100 plants, about how many would have height 50 cm?

Consider the following case of blending inheritance. A population of plants starts out with an equal number of individuals of heights 40 and 60 cm. The parents mate randomly, and the height of an offspring is exactly equal to the average height of its parents. Find the probability of each of the possible matings of the offspring. Out of 100 plants, about how many would have height 50 cm?

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 15CTQ: Use a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous...

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Consider the following case of blending inheritance. A population of plants starts out with an equal number of individuals of heights 40 and 60 cm. The parents mate randomly, and the height of an offspring is exactly equal to the average height of its parents. What is the probability that a 60-cm tall plant mates with a 60-cm tall plant, and the probability that a 40-cm tall plant mates with a 60-cm tall plant?
Consider the following case of blending inheritance. A population of plants starts out with an equal number of individuals of heights 40 and 60 cm. The parents mate randomly, and the height of an offspring is exactly equal to the average height of its parents. Find all the ways that the heights of the grandparents average to exactly 50 cm.
Suppose you do a cross between two parents who are both heterozygous for two traits, such as petal shape (narrow or wide, narrow is dominant) and flower color (red or white, red is dominant). If there are 160 offspring, how many would you expect to have wide petals with red flowers?
When traits show complete dominance, the genotype can be revealed by a test cross. In the example of tall and dwarf plants (Figure) why is it necessary to use the dwarf parent? In general, why is it necessary to use a parent that is homozygous recessive?
Imagine you cross two closely related plant varieties: Maize and teosinte. You hypothesize that different alleles at just 5 genes are responsible for all the trait differences between the two plants. You take two inbred parent lines and cross them together to produce an F1 and then cross two F1 individuals together to produce F2 offspring. What proportion of the offspring do you expect to look exactly like each of the parent lines if your hypothesis is correct? Please show work using punnet squares.
Imagine that a plant with red flowers is bred to one with white flowers and when they make fruits, the seeds are collected and grown into new plants. The new plants, when old enough, have only pink flowers. Which plants are the parental generation? Which are the first filial generation? If the pink-flowered plants are interbred with each other and the resulting seeds planted, what would that generation be called?
Suppose a plant is heterozygous with genotype Aa. What is the probability that the allele that came from the pollen is type A? What is the probability that the allele that came from the ovule is type A?
In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short? 1 0 1 ½ ¼
In a genetic cross between a homozygous tall plant with homozygous purple flowers and a homozygous short plant with heterozygous purple flowers, how many short plants will you expect in the F2 generation if you sample 36 individuals? Both tall and purple are dominant.
Describe one of the reasons that made the garden pea an excellent choice of model system for studying inheritance.
Suppose a species of tulip has three alleles for the gene that codes for flower color. The CR allele produces red tulips, the CB allele produces blue tulips, and the CW allele produces white tulips. Both CR and CB are dominant over CW, but CR and CB are incompletely dominant with each other, so CRCB heterozygotes have purple flowers. What is the expected phenotypic ratio in the offspring of the following crosses, in the order red : blue : purple : white? Enter your answers as the most simplified ratio (e.g. 1 : 2 : 1 : 1 instead of 2 : 4 : 2 : 2). Enter 0 if none of the offspring from a cross will be a particular color. CRCB × CBCW _____ red : ______blue : ______purple : ______white CRCB × CRCW - _______red : _____blue : _____purple : _____white CRCW × CBCW - _____red : _____blue : _____purple : _____white CRCB × CRCB - red : blue : purple : white
Consider three yellow, round peas, labeled A, B, and C. Each was grown into a plant and crossed to a plant grown from a green, wrinkled pea. Exactly 100 peas derived from each cross were sorted into phenotypic classes as follows: A: 51 yellow, round 49 green, round B: 100 yellow, round C: 24 yellow, round 26 yellow, wrinkled 25 green, round 25 green, wrinkled What are the genotypes of plants A, B, and C? (Use gene symbols of your own choosing; be sure to define each one.)