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35 terms

7th Science: Heredity & Genetics Review

STUDY
PLAY
Learned
Playing soccer and reading are examples of ________ traits.
Inherited
Eye color and dimples on your face are examples of _______ traits.
Dominant
Strong allele, written as a capital letter, like D. It overrules any weak alleles and masks their presence.
Recessive
Weak allele, written as a lowercase letter, like d. It must be paired with another weak allele, like dd, to be seen.
Heterozygous
Two different alleles, shown by a capital and a lowercase, like Dd. It's also called "hybrid".
Homozygous
Two of the same alleles, like DD or dd. It's also called "purebred".
Genes
Segments of DNA, located on chromosomes, that carry instructions for the traits of an organism. It's the code for your traits.
Genotype
The gene for a trait, shown by letters. Example: BB, Bb, or bb.
Phenotype
The outward appearance of a trait, controlled by the genes. Example: Brown hair.
Alleles, genes, DNA, chromosomes, nucleus, cell
The levels of hereditary organization, starting from the smallest.
Homeostasis
Maintaining a stable, internal environment of an organism.
Feedback Mechanism
A process that helps an organism change an internal condition to return to homeostasis. Example: An athlete sweating to get his body temperature back to normal.
Punnett Square
A box drawn to determine the probability of offspring receiving certain traits.
Homozygous recessive
dd is an example of a __________ gene.
Homozygous dominant
DD is an example of a __________ gene.
Heredity
The passing of genetic instructions, or traits, from one generation to the next is ____________.
Genetics
Gregor Mendel is considered the Father of _____________ because his work most contributed to this field of science.
DNA
The "genetic material" found in the genes that make up the chromosomes inside the nucleus of cells.
23
Humans have ______ pairs of chromosomes, making 46 chromosomes total.
Asexual reproduction
Type of reproduction in which there is only one parent. Offspring have NO DIVERSITY (no differences). The babies are all identical to each other and to the parent.
Diversity
Another word for "differences, variety, or variations". Example: The offspring that result from sexual reproduction are NOT all identical; instead, there is plenty of ___________.
Zygote
A fertilized egg, formed through sexual reproduction.
Sperm and egg
The two types of sex cells, one from the male and one from the female, that will create offspring through fertilization.
Offspring
Another word for an organism's babies. Example: The ___________ of a single bacterium are all identical clones of the parent.
Sexual reproduction
Type of reproduction that combines genes from two parents and results in diverse offspring.
Binary fission
Type of ASEXUAL reproduction in which an organism copies itself, then divides into two identical organisms. Example: bacteria, paramecia
Adapt
One major advantage of sexual reproduction is that it allows species to _________ to their environment.
Quickly
One major advantage of ASEXUAL reproduction is that it allows species to produce many offspring __________.
Budding
Type of ASEXUAL reproduction in which an organism produces an offshoot that breaks away to live on its own. Example: Hydra
Regeneration
Type of ASEXUAL reproduction in which an organism uses cell division to regrow body parts. Example: Starfish
Vegetative propagation
Type of ASEXUAL reproduction in which part of an existing plant is cut off and grows into a new plant. Example: Strawberries
25% (one fourth)
Using a punnett square, what percentage of offspring from Nn x Nn would be nn?
50% (half)
Using a punnett square, what percentage of offspring from EE x Ee would be Ee?
Nucleus
DNA makes up chromosomes, which are found in the ___________ of cells.
Cells, tissues, organs, organ systems, organism
The levels of cellular organization, starting from the smallest.