BMST - Basic Math and Science Genetics and Heredity Questions and Answers Flashcards
6 cards from real BMST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 BMST - Basic Math and Science Genetics and Heredity Questions and Answers flashcards as text
What is a gene?
Answer: A segment of DNA that codes for a protein
A gene is a specific segment of DNA that contains the instructions for making a protein.
What term describes an organism that has two identical alleles for a trait?
Answer: Homozygous
Homozygous means both alleles for a gene are the same (e.g., TT or tt).
In a Punnett square cross of Tt × Tt, what fraction of offspring are expected to be TT (homozygous dominant)?
Answer: 1/4
A Tt × Tt cross produces a 1 TT : 2 Tt : 1 tt ratio, so 1/4 of offspring are TT.
Which nitrogenous base pairs with adenine in a DNA molecule?
Answer: Thymine
In DNA, adenine always pairs with thymine via two hydrogen bonds.
What term describes an allele that is expressed only when two copies are present?
Answer: Recessive
A recessive allele is only expressed in the phenotype when the organism is homozygous recessive.
How many chromosomes are found in normal human somatic (body) cells?
Answer: 46
Human somatic cells are diploid and contain 46 chromosomes arranged in 23 pairs.