13. Mendelian Genetics

Mendel's Laws

Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. Draw a diagram illustrating what happens to these genes and alleles when meiosis occurs in your reproductive tissues.

Law of Segregation

 would have contained four phenotypes in a 9:3:3:1 ratio 

 No. This is what happens when the genes are located on different chromosomes. 

 would have contained only individuals that were heterozygous at both loci 

 would have contained no individuals that were heterozygous at both loci 

 None of the listed responses is correct. 

 No. One of the listed responses is correct. 

 would have deviated from the 9:3:3:1 phenotypic ratio that is predicted by the law of independent assortment 

The law of independent assortment applies only when the loci are present on different chromosomes; genes with loci close together on the same chromosome tend to be inherited together.

If the two traits that Mendel looked at in his dihybrid cross of smooth yellow peas with wrinkled green peas had been controlled by genes that were located near each other on the same chromosome, then the F2 generation __________.

What two major lineages make up the living Amniota?

Mendel’s Law of Independent Assortment Explained

Mendel's Law of Segregation

 states that the alleles at different loci segregate independently from one another during a dihybrid cross 

 No. This statement is true, but it is not the best response. 

can account for a 9:3:3:1 ratio seen in the F2 generation

 applies only to genes that are present on different chromosomes (or behave as if they were) 

 The first and second answers are correct. 

 The first, second, and third answers are correct. 

The law of segregation was derived from studying monohybrid crosses, and the law of independent assortment was based on studies of dihybrid crosses.

The law of independent assortment __________.

Mendel´s Laws - Inheritance

Crossing over of homologous pairs of chromosomes.

Alignment of pairs of homologous chromosomes along the middle of the cell.

The division of cells during cytokinesis.

Mendel's law of independent assortment has its basis in which of the following events of meiosis I?

Law of Independent Assortment

What is a lophophore?
a. a specialized filter-feeding structure
b. the single opening in species with a blind gut
c. a distinctive type of larva with a band of cilia
d. a synapomorphy that defines lophotrochozoans

Mendel's Law of Segregation Explained

Laws of Genetics - Lesson 5 | Don't Memorise

Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. Label the stages of meiosis, the homologous chromosomes, sister chromatids, nonhomologous chromosomes, genes, and alleles.

Which statement is true about endothermy in mammals and birds?
a. They both inherited this trait from a common ancestor.
b. Birds are more closely related to mammals than to reptiles.
c. Endothermy arose independently in these two lineages.
d. Birds are reptiles and all reptiles are ectothermic.

Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?

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