Concept explainers
To show:
The results of a cross between a heterozygous yellow- seed plant and a green- seed plant by using a Punnett square
Introduction:
A cross that involves hybrids for a single trait is called a monohybrid cross. Punnett developed a method to predict the possible offspring of a cross between two known genotypes. It is easier to keep a track of the possible genotypes involved in a cross. An organism with two of the same alleles for a particular trait is called homozygous while an organism with two different alleles for a particular trait is called heterozygous.
Answer to Problem 10STP
Crossbetween a heterozygous yellow- seed plant and a green- seed plant can be shown by using a Punnett square as follows:
Y | y | |
y | Yy | yy |
y | Yy | yy |
Explanation of Solution
A heterozygous yellow- seed plant can be represented as Yy .
A green- seed plant can be represented as yy. (Since green is a recessive trait, it will be expressed only in homozygous condition.)
AYyyellow - seed plant will produce two types of gametes- male and female- each with either the Y allele or y allele. Ayy green seed plant will produce two types of gametes- male and female- both with y allele. If a yellow- seed plant ( Yy ) is crossed with a green- seed plant ( yy ), there are only two possible genotypes; Yy and yy . So the resulting
This can be checked by drawing a Punnett square as shown below.
Y | y | |
y | Yy | yy |
y | Yy | yy |
Chapter 11 Solutions
Biology Illinois Edition (Glencoe Science)
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