Exam 11: Single-Gene Inheritance and Meiosis Rock for a Cause

You have two parental varieties of peas: tall plants with axial flowers and short plants with terminal flowers.When the short plants with terminal flowers variety were crossed with the tall plants with axial flowers variety,all of the offspring were tall plants and axial flowers.You then cross these tall axial offspring with each other.Show a Punnett square for this cross.What are the phenotypes and genotypes of your offspring?

A phenotype is

Fill in the blank with mitosis or meiosis. A. Humans produce gametes by the process of ________. B. A zygote becomes a fetus by the process of_________. C. A baby develops into an adult by the process of __________. D. A cut in your skin is repaired by the process of _________. E. Sperm and egg cell are produced by the process of _______. F. Repair of our cells is accomplished by the process of _________.

Is a change in nucleotide sequence always detrimental?

You have inherited the following alleles on three separate chromosome pairs: Show the possible gametes you could produce as a result of independent assortment.

Both parents have one copy of a dominant allele for gene 87 and one recessive allele for Gene 87.What is the chance that their children will inherit the recessive condition (two copies of Gene 87)? You may need to draw a Punnett square to figure this out.

What is meiosis?

What percentage of man's chromosomes are found in a single sperm cell?

Achondroplasic dwarfism is a dominant characteristic."D" represents the allele for achondroplasic dwarfism,and "d" represents the allele for normal height.A couple who both exhibit achondroplasic dwarfism marry and have four children.Three of the children are dwarves and one is of normal height.What is the genotype of the child with normal height? What is the genotype of the parents?

Two normal individuals have a child who has cystic fibrosis,an autosomal recessive disease.What were the chances of this happening? (Draw a Punnett square to help you determine the answer.)

Two people with Huntington disease,an autosomal dominant disorder,have a son.What are the chances he will get the disease? (Draw a Punnett square to help you determine the answer.)

How are the X and Y chromosomes in males different from other diploid cells?

Many genetic disorders are the result of having either more than two or less than two chromosomes.Down syndrome,for example,results when a child has three copies of chromosome 23.How do you think such a situation could occur?

Which of the following statements is TRUE?

The appearance of an organism is known as its

Which of the following statements is FALSE?

Sexual reproductive cells are called

The process responsible for making chromosomes that have pieces taken from two different chromosomes is called

Explain why sperm and egg must be haploid and not diploid.

Achondroplasic dwarfism is a dominant characteristic."D" represents the allele for achondroplasic dwarfism,and "d" represents the allele for normal height.A couple who both exhibit achondroplasic dwarfism marry and have three children.All of the children are dwarves.What is the genotype of their children? Show possible Punnett squares.