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In a population of plants, the average height of mature plantsis 12 inches. You pick seeds from the tallest ten plants, whichhave an average height of 14 inches. If theheritability of height in this species is 0.5,what will the average height of plants be that grow up from theseeds you picked?

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Patrina Schowalter
Patrina SchowalterLv2
28 Sep 2019

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Related questions

Plant competition lab:

Objectives

In this lab, we will conduct an experiment to test both interspecific competition (between radish and collards plants) and intraspecific competition (radishes competing with radishes, or collards competing with collards). To determine if competition is occurring, we will measure survival, plant height, and aboveground biomass. Once the lab is completed and the data are collated from the entire class, you will then need to make graphs and answer the questions at the end of the lab.

Procedure:

Take 9 pots. Use only pots of the same shape (square or round); do not mix types.

Fill the pots with soil to within ½ inch of the top.

Thoroughly water the soil (until it runs out the bottom).

Add more soil if necessary to bring up the level to within ½ inch of the top.

Place the appropriate number of seeds on the soil surface. Be sure the seeds are evenly spaced. In the mixed species pots, intersperse the two species. See the table below for the nine different treatments.

Cover the seeds with a thin layer of soil. DO NOT water the soil again.

Label the pot with your name and the treatment on a piece of tape.

Before harvesting any plants in a pot, collect the following data:

Number of surviving radishes

Number of surviving collards

Average height of surviving radishes (cm)

Average height of surviving collards (cm)

2. After counting and measuring surviving plants, clip each plant where the stem meets the soil. If your pot is a mixed-species treatment, separate radishes from collards.

3a. For single-species treatments:

Weigh all plants within a pot for the total aboveground biomass (g)

Divide the total aboveground biomass by the number of plants that were alive in the pot, to calculate the mean aboveground biomass (g per plant)

3b. For mixed-species treatments:

Weigh all the plants of each species separately, for total aboveground biomass (g) for each species

For each species separately, divide the total aboveground biomass by the number of plants of that species that were alive in the pot, to calculate the mean aboveground biomass (g per plant, within a species)

Experimental Design

Single-species treatments (intraspecific competition tests)

4 collard seeds

16 collard seeds

36 collard seeds

4 radish seeds

16 radish seeds

36 radish seeds

Mixed-species treatments (interspecific competition tests)

2 collard + 2 radish seeds (4 total seeds)

8 collard + 8 radish seeds (16 total seeds)

18 collard + 18 radish seeds (36 total seeds)

Your mixed-species seeds should be arranged in a Latin square design, as shown below (the immediate neighbors of each seed are the other species).

--> Questions to consider about this lab

A. Hypotheses:

B. Which treatments are the controls and which are the experimental treatments?

C. What are the replicates in this experiment? How many are there for each treatment?

D. Do you see any inherent sources of bias in this experimental design?

E. Are there any problems with the experimental design that you can identify which might make interpretation of the data difficult or impossible?

Assume that plant height and flower size in Four O'Clock plants display antogonistic phenotypes. Four O'Clock plants can be tall or short and the flowers can be large or small. Assume each trait is governed by alleles of a single gene and that each follows Mendel’s first and second laws. You start with two pure breeding strains, one that is tall with large flowers and a second that is short with small flowers. You cross these two strains to each other to generate F1 plants. You self-cross an F1 plant and grow 342 of the resulting seeds into plants. You find that 195 plants are short with large flowers, 62 plants are short with small flowers, 59 plants are tall with large flowers, and 26 plants are tall with small flowers.

For the cross above- what is the phenotype of the F1 individuals?

A. Short with small flowers
B. Tall with small flowers
C. Medium height with medium size flowers
D. Short with large flowers
E.Tall with large flowers
F. Can't tell from the information provided

Please explain I'm really confused

In a large population of an annual wild pea species, height is controlled by a single locus; DD and Dd individuals are tall, while dd individuals are short. Because the local environment is very windy, tall plants tend to get broken and survive to reproduce only half as well as well as do short plants. Mating is random with respect to height and there is no immigration or emigration. In a population of 21,000 (large enough to be considered infinite for the purposed of the Hardy-Weinberg equilibrium and natural selection models; assume this population size remains constant through the generations described in this question) adult pea plants that successfully reproduce after natural selection through differential survival has occurred, there are 7,000 DD individuals, 7,000 Dd individuals, and 7,000 dd individuals.

a) What will be the frequency of the D allele in the gametes (sperm, in pollen, and ovules) that will unite to make up the next generation?

b) What will be the genotype frequencies of DD, Dd, and dd in the seeds that are formed to start the next generation? How many seeds will there be with each genotype?

c) What will be the genotype frequencies of DD, Dd, and dd in the adults that develop from these seeds and survive to reproduce? How many adults will there be with each genotype?

d) Over a long period of time, what do you expect to happen to the D and d alleles in this population? Why?

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