Biology
If an animal has 32 chromosomes in his body so the number of chromosomes present in each egg and sperm is
16
If a couple has two girls and one boy the chances that the next child being a boy is
50%
Nondisjunction of the sex chromosomes in a woman who lead to a child with the genotype
A, B, C
The cross that will yield four phenotypes in a ratio of 9:3:3:1 is
AaBb+ AaBb
in the cross between homozygous red eyed drosophila female and white eyed males
All the offspring will have red eyes
Meiosis occurs during
Both spermatoenesis in oogenesis
A DNA molecule
Contains information for the construction of proteins
At the end of the second meiotic division in meiosis there is
Four cells each with 1/2 the normal cells chromosomes
When all the genetic and other influencing factors are considered the basic and here is the unit of life is the
Gene
Black short haired shmoos with the genotype of BBSS are
Homozygous dominant
A light green phenotype produced between a dark green and a white green phenotype would be an example of
Incomplete dominance
The structure in DNA that apparently serves the function of genes or as a source of code information is the
Nitrogen base sequence
A person whose blood type test shows need approaching a or B present has a blood type
O
In the phenomenon known as crossing over
Part of the chromatids are exchange
Turner syndrome
Trade you the genotype XO
ABO blood groups
Trait controlled by multiple alleles
Down syndrome
Trait due to trisomy of chromosome 21
Sickle cell trait
Treat due to incomplete dominant genes and heterozygous state
Hemophilia
Treat due to sex linked recessive gene
BB
dominant pure breed
A person with a pair of genes that produce blonde hair is homozygous for hair color
false
All inherited conditions are apparent birth
false
Crossing over normally occurs between nonhomologous chromosomes
false
If the parent genotype are Aa and Aa only two possible genotypes are among the offspring.
false
In animals, males always carry two X chromosomes
false
1:2:1
genotype ratio
Bb
hybrid
Changes in the base of a nucleotide in DNA are called a
mutation
3:1
phenotype ratio
bb
recessive alleles
According to Mendel's first law, alleles segregates from one another during the formation of gametes
true
As the sample size gets larger the ratio of the results obtained approaches the theoretical prediction.
true
Genetic information is passed from parent to offspring in the form of DNA
true
If a person has one pair of genes for a trait, normally only one of these genes can be transmitted to an offspring.
true
Mature sex cells are called gametes
true
