SCIENCE QUIZ 1 REALLY HARD

Which of these paired genes is homozygous?

PP and pp

What is the probable Phenotype of the parents (P1)?

all round

Mendel's principle of segregation implies that the two members of an allelic pair of genes:

are distributed to separate gametes

Each P1 parent of a monohybrid cross has completely identical genes.

false

In the cross BB × bb the percent of offspring in the F1 generation that will have the same genotype as their parents is:

0%

The probability that both of two tosses coins will come down heads(or tails) is:

1/2 × 1/2 or 1/4

What is the probable genotypes of the wrinkled seeds which produced (F1)?

rr only

If the parent genotypes are Aa and Aa, the offspring are expected to be:

1/4 AA, 1/2 Aa, 1/4 aa

The second generation phenotypes resulting from the cross of true-breeding monohybrid pollination will display a ratio of:

1:3

Indicate the phenotypic ratio of crossing the offspring of the agouti and chinchilla.

3/4 agouti, 1/4 chinchilla

How many combinations of genotypes are possible for the coat coloration of rabbits which is governed by three alleles?

6

In considering the cross from YyRr and YyRr, the ratio of traits will be -blank- yellow smooth, -blank- yellow wrinkled, -blank- white smooth, and -blank- white wrinkled.

9, 3, 3, 1

In considering this cross (YyRr and YyRr), the phenotype ratios of F2 generation will be

9:3:3:1

In considering this cross (YyRr and YyRr), the genotype ratio is: YYRR; 2YYRr; 2Yyrr;4YyRr;YYrr;2Yyrr;yyRR;yyrr

false

How can knowledge of genetics be used to improve the agricultural production of food?

Breeding plants of known genotypes will bring together new combinations of genes that provide increased disease resistance, increased food value, and increased productivity

Different forms of a given gene are known as:

alleles

This cross will yield four phenotypes in the 1:1:1:1 ratio:

RrYy×rryy

Genes that carry contrasting inheritance factors are called:

heterozygotes

In a dihybrid cross, the F2 will have nine genotypes, but only four phenotypes because the -blank- genes cause the -blank- traits to mask the -blank- traits.

heterozygous, dominant, recessive

A (TT) genotype is said to be:

homozygous

When neither of the genes of a pair are dominant nor recessive, the genes are said to be:

incomplete dominant alleles

A family has seven sons. The chance that their eighth child will be a daughter is:

one chance in two

The outward appearance of a particular trait is called the

phenotype

A reptile has never been observed to give birth to a bird.

true