Biology

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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


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