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Where are the microsporangia located?
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Starting with the microspore mother cell, how many meiotic and mitotic cell divisions are required to produce the mature male gametophyte?
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HORT1001 Wk 14

Gametogenesis; Inheritance of big/little differences

QuestionAnswer
Where are the microsporangia located? Inside the androecium (stamens) in the anther
Starting with the microspore mother cell, how many meiotic and mitotic cell divisions are required to produce the mature male gametophyte? 2 mitotic divisions and 1 meiosis
Where are the megasporangia located? They are the ovules in the ovary in the gynoecium (carpels)
Is the female gametophyte diploid or haploid? Diploid
Starting with the megaspore mother cell, how many meiotic and mitotic cell divisions are required to produce the mature female gametophyte? 1 meiosis and 3 mitotic divisions Forms embryo sac with 8 cells total
How many nuclei are in the pollen tube just prior to meeting the egg cell? 2 or 3. 1 vegetative and either 1 generative or 2 sperm depending on when the generative cell undergoes mitosis
Where is the apical cell of the embryo and what does it do? The inner surface of the maturing ovule wall (seed coat), Held to the nucellus tissue by a suspensor formed by the basal cell
A heart-shaped embryo has two swollen lobes that give it the shape of a heart. What will those lobes become when the embryo is mature? Cotyledons
Why do linked genes assort together? They are very close together on the chromosome
If I showed you a frequency distribution with two sharp peaks, would you expect that it represents a qualitative or quantitative trait? With four sharp peaks, would you expect that it represents a qualitative or quantitative trait? Qualitative
If I showed you a frequency distribution that looked like a mound with one high point, would you expect that it represents a qualitative or quantitative trait? Quantitative
Would a breeder anticipate making greater gain from selection for a trait that has high heritability or low heritability? High
If a characteristic is very heavily influenced by the environment and exhibits very little control by genotype, will the heritability be close to 0 (very low heritability) or close to 1 (very high heritability)? 0, Low
When a megaspore undergoes three mitotic divisions, how many cells are produced in total from that single megaspore? 8
True or false, pollen morphology can be used to identify the genus and species that produced it. True
Where in the flower are the microspore mother cells located? In the anther
What tissue in the seed is formed by the union of a sperm cell from the male gametophyte with two polar nuclei from the female gametophyte? Endosperm
The closer two loci are physically linked on the same chromosome: the more likely the loci are to assort together.
If flower color data from 100 plants showed that 75% of the plants had red flowers and 25% had white flowers, you would suspect that: flower color is a qualitative trait
If alleles are different, it is because they differ in: the sequence of bases making up their DNA.
A plant’s genotype is: the sequence of bases in the DNA of genes controlling plant traits.
For a plant characteristic that is inherited in a quantitative way, the influence of the environment on the plant: is usually an important factor in determining the phenotype.
The hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in a plant is a: gene
When a plant breeder makes a cross in a specific direction: They are choosing which parent to use as male and which as female
Created by: kylee1542
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