nath 3

reduction of chromosome number during meiosis

A major characteristic distinguishing meiosis from mitosis is ______.

Ability to wind DNA into a nucleosome structure

A chemical inhibits histones 1–4 but not histone 5. Which process would be disrupted?

Types A and B only

A person with type AB blood has offspring with a person with type O blood. Which blood types are possible?

transcription

When a cell synthesizes RNA from DNA, it has undergone ______.

aneuploidy

Having more or less than the diploid number of chromosomes is called ______.

i

Which ABO blood-group allele most likely encodes a nonfunctional protein?

Punnett square

. A tool used by geneticists to predict results of crosses is a ______.

deoxyribose

The pentose sugar of DNA is ______.

A

What is the phenotype of an individual with genotype I^A i?

molecular genetics

The study of the structure and function of DNA and RNA is called ______.

Adenine-thymine

Which is a correct DNA base pair?

diploid

Animal somatic cells are normally ______.

9:3:3:1

The expected phenotypic ratio in the F2 generation of a dihybrid cross is ______.

Diploid

what term describes a cell with two sets of chromosomes?

cytoplasmic division

Cytokinesis refers to ______.

tRNA

The RNA that carries amino acids to ribosomes and helps position them for incorporation into a polypeptide is ______.

replicated chromatids align in the center of the cell

During metaphase of mitosis, ______.

Cancer

Uncontrolled growth that can occur when cell-cycle control mechanisms fail is called ______.

daughter chromosomes move to opposite poles

During anaphase of mitosis, ______.

homozygous

An organism carrying two identical alleles for a trait is ______.

translation

Protein synthesis at ribosomes based on genetic information in mRNA is called ______.

deoxyribose, a nitrogenous base, and a phosphate group

A DNA nucleotide contains ______.

. autosomes

Chromosomes not involved in determination of sex are called ______.

Mendel

The studies of ______ began the modern study of genetics

nuclear division

Mitosis is most correctly defined as ______.

Prophase I

Which phase of meiosis is especially important as a source of genetic variation?

nucleoli and nuclear envelope begin to break down

during prophase of mitosis, ______.

I^B I^B and I^B i

What are the possible genotypes for blood type B?

daughter chromosomes arrive at opposite poles of the cell

Telophase begins when ______.

UCUAGA

The DNA template strand AGATCT leads to an mRNA strand with sequence ______.

only in the homozygous condition

In complete dominance, a recessive allele is expressed ______.

A classic example of multiple-allele inheritance is ______.

A, B, AB, and O human blood types

Crossing over between nonsister chromatids

What key event of prophase I contributes to genetic variation?

point mutations

Changes in single nucleotides on DNA are called ______.

alternate forms of a gene

Alleles are ______.

adenine and guanine

The purine bases of nucleic acids are ______.

pyrimidines

The single-ring nitrogen-containing organic bases of RNA and DNA are called ______.

Which pairing is correct?

The fifth histone and nucleosome formation

replication

The process producing a copy of a DNA molecule is called ______.

gene

A sequence of DNA bases that codes for synthesis of one polypeptide is a ______.